Bitcoin Forum

Bitcoin => Mining support => Topic started by: mindtrip on May 29, 2014, 11:26:40 AM



Title: Antminer S2 Support and Overclocking Thread
Post by: mindtrip on May 29, 2014, 11:26:40 AM
Since there is scattered info on the Antminer S2's I thought it would be a good idea to start a thread dedicated to the support and overclocking of the newer S2's

So Far I have replaced my PSU with a newer Enermax 1350Watt Platinum rated as I believed the stock PSU was pushed to close to the limit, this should add some additional head room to OC the boards

My first attempt to SSH into the unit has failed look like the SSH password is not the same as the web interface does anyone know this? SOLVED

WEB LOGIN root
WEB PASSWORD root

SSH LOGIN root
SSH PASSWORD admin

OVERCLOCKING STEPS *PLEASE NOTE THIS IS DONE AT YOUR OWN RISK* IF THIS WORKS FOR YOU PLEASE DONATE FOR THE TIME I INVESTED IN THIS IF YOU FEEL IT WILL MAKE YOU MONEY :)

Step 1 Using Putty  or another program SSH into your Miner
Step 2 Click "YES" on the "Security Alert" that pops up
Step 3 Login with User: root Password: admin
Step 4 Type "cd /config"
Step 5 Type "vi asic-freq.config
Step 6 Hit the "I" key to edit the file
Step 7 Scroll the the bottom and copy this code and click in the SSH window to paste it (I suggest you start with the 212M Settings run it for a few hours make sure your miner is stable then work your way up)
    option 'freq_value'    '5082'  #212M
    option 'chip_freq'     '212.5'
    option 'timeout'       '36'

    #option 'freq_value'    '6206'  #216M
    #option 'chip_freq'     '215.625'
    #option 'timeout'       '37'

    #option 'freq_value'     '5102'  #219M
    #option 'chip_freq'      '218.75'
    #option 'timeout'        '38'

Step 8 be sure to add "#" in front of everything listed on the 196M line
Step 9 Hit "esc" then type ":wq"
Step 10 (IMPORTANT) type "cp asic-freq.config /etc/asic-freq.config"
IF YOU SKIP THIS STEP ALL SETTINGS WILL BE LOST WHEN YOU POWER CYCLE THE MINER
Step 11 Now Login to the web interface of your miner and go to the miner config tab and click "save and apply" this will restart cgminer with the new settings

Based on my testing here is how my miner performed at each speed

212mhz     1083GH     (+56 Watts)(+80GH Speed)(HW Error 0.22%)
216mhz     1098GH     (+71 Watts)(+95GH Speed)(HW Error 0.39%)
219mhz     1114GH     (+90 Watts)(+111GH Speed)(HW Error 0.88%)

Keep in mind your results might vary. Enjoy and happy mining  :)


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Lucko on June 02, 2014, 07:14:20 PM
OK so how did you changed speed to 200? What is posible with stock PSU?


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Biodom on June 02, 2014, 08:13:46 PM
You forgot to post freq value and timeout for 200.
I have a spare EVGA 1300 and wonder if I can mildly overclock (only if it will be stable).



Title: Re: Antminer S2 Support and Overclocking Thread
Post by: GWilkiejr on June 02, 2014, 11:43:08 PM
Since there is scattered info on the Antminer S2's I thought it would be a good idea to start a thread dedicated to the support and overclocking of the newer S2's

So Far I have replaced my PSU with a newer Enermax 1300Watt Platinum rated as I believed the stock PSU was pushed to close to the limit, this should add some additional head room to OC the boards

My first attempt to SSH into the unit has failed look like the SSH password is not the same as the web interface does anyone know this? SOLVED

WEB LOGIN root
WEB PASSWORD root

SSH LOGIN root
SSH PASSWORD admin

Cant seem to navigate to cd/etc/config directory I get "Permission Denied"

UPDATE File structure is different I have identified where the files are I have successfully raised clock from 196 to 200 Minimal HW error increase (0.08%) and No Temp increase. Small speed increase average is now 1.07TH

Next Id like to compile a list of frequency settings, Power draw for each and HW error rate at each level
Thanks to klondike_bar for this:

option 'freq_value'    '6206'  #216M
    option 'chip_freq'     '215.625'
    option 'timeout'       '37'


    #option 'freq_value'    '5082'  #212M
    #option 'chip_freq'     '212.5'
    #option 'timeout'       '36'

    #option 'freq_value'     '5102'  #219M
    #option 'chip_freq'      '218.75'
    #option 'timeout'        '38'


Please help with any info you can share

Ok so how did you access those files once you logged in?  I can't seem to access anything.  The same lines from the S1 do not get you to the dance so to speak. 


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: mindtrip on June 03, 2014, 10:53:46 AM
Since there is scattered info on the Antminer S2's I thought it would be a good idea to start a thread dedicated to the support and overclocking of the newer S2's

So Far I have replaced my PSU with a newer Enermax 1300Watt Platinum rated as I believed the stock PSU was pushed to close to the limit, this should add some additional head room to OC the boards

My first attempt to SSH into the unit has failed look like the SSH password is not the same as the web interface does anyone know this? SOLVED

WEB LOGIN root
WEB PASSWORD root

SSH LOGIN root
SSH PASSWORD admin

Cant seem to navigate to cd/etc/config directory I get "Permission Denied"

UPDATE File structure is different I have identified where the files are I have successfully raised clock from 196 to 200 Minimal HW error increase (0.08%) and No Temp increase. Small speed increase average is now 1.07TH

Next Id like to compile a list of frequency settings, Power draw for each and HW error rate at each level
Thanks to klondike_bar for this:

option 'freq_value'    '6206'  #216M
    option 'chip_freq'     '215.625'
    option 'timeout'       '37'


    #option 'freq_value'    '5082'  #212M
    #option 'chip_freq'     '212.5'
    #option 'timeout'       '36'

    #option 'freq_value'     '5102'  #219M
    #option 'chip_freq'      '218.75'
    #option 'timeout'        '38'


Please help with any info you can share

Ok so how did you access those files once you logged in?  I can't seem to access anything.  The same lines from the S1 do not get you to the dance so to speak. 
Yes I had to change to 1300 Watt PSU even running 1 unit stock the other with modified PSU i noticed a reduction in HW Errors so I say a PSU upgrade is a must. When I get to work later I will post instructions on which files to modify and settings for 200Mhz Clock. I am putting together a chart of Clock Speeds with GH gain and Watt increase so far I am up to 1.1TH Average for 71 Watt increase from Stock. Just FYI the 200MHZ clock is already loaded in there but modifying the file is a little different then on the S1's I will post some screen grabs and step by steps on this soon


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Lucko on June 05, 2014, 09:52:49 PM
Step 1 Using Putty  or another program SSH into your Miner
Step 2 Click "YES" on the "Security Alert" that pops up
Step 3 Login with User: root Password: admin
Step 4 Type "cd /config"
Step 5 Type "vi asic-freq.config
Step 6 Hit the "I" key to edit the file
Step 7 Scroll the the bottom and copy this code and click in the SSH window to paste it (I suggest you start with the 212M Settings run it for a few hours make sure your miner is stable then work your way up)
    option 'freq_value'    '5082'  #212M
    option 'chip_freq'     '212.5'
    option 'timeout'       '36'

    #option 'freq_value'    '6206'  #216M
    #option 'chip_freq'     '215.625'
    #option 'timeout'       '37'

    #option 'freq_value'     '5102'  #219M
    #option 'chip_freq'      '218.75'
    #option 'timeout'        '38'

Step 8 be sure to add "#" in front of everything listed on the 196M line
Step 9 Hit "esc" then type ":wq"
Step 10 (IMPORTANT) type "cp asic-freq.config /etc/asic-freq.config"
IF YOU SKIP THIS STEP ALL SETTINGS WILL BE LOST WHEN YOU POWER CYCLE THE MINER
Step 11 Now Login to the web interface of your miner and go to the miner config tab and click "save and apply" this will restart cgminer with the new settings

Based on my testing here is how my miner performed at each speed

212mhz     1083GH     (+56 Watts)(+80GH Speed)(HW Error 0.22%)
216mhz     1098GH     (+71 Watts)(+95GH Speed)(HW Error 0.39%)
219mhz     1114GH     (+90 Watts)(+111GH Speed)(HW Error 0.88%)

Keep in mind your results might vary. Enjoy and happy mining  :)

Do you know what is posible with stock PSU?


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: mindtrip on June 05, 2014, 10:22:17 PM
Step 1 Using Putty  or another program SSH into your Miner
Step 2 Click "YES" on the "Security Alert" that pops up
Step 3 Login with User: root Password: admin
Step 4 Type "cd /config"
Step 5 Type "vi asic-freq.config
Step 6 Hit the "I" key to edit the file
Step 7 Scroll the the bottom and copy this code and click in the SSH window to paste it (I suggest you start with the 212M Settings run it for a few hours make sure your miner is stable then work your way up)
    option 'freq_value'    '5082'  #212M
    option 'chip_freq'     '212.5'
    option 'timeout'       '36'

    #option 'freq_value'    '6206'  #216M
    #option 'chip_freq'     '215.625'
    #option 'timeout'       '37'

    #option 'freq_value'     '5102'  #219M
    #option 'chip_freq'      '218.75'
    #option 'timeout'        '38'

Step 8 be sure to add "#" in front of everything listed on the 196M line
Step 9 Hit "esc" then type ":wq"
Step 10 (IMPORTANT) type "cp asic-freq.config /etc/asic-freq.config"
IF YOU SKIP THIS STEP ALL SETTINGS WILL BE LOST WHEN YOU POWER CYCLE THE MINER
Step 11 Now Login to the web interface of your miner and go to the miner config tab and click "save and apply" this will restart cgminer with the new settings

Based on my testing here is how my miner performed at each speed

212mhz     1083GH     (+56 Watts)(+80GH Speed)(HW Error 0.22%)
216mhz     1098GH     (+71 Watts)(+95GH Speed)(HW Error 0.39%)
219mhz     1114GH     (+90 Watts)(+111GH Speed)(HW Error 0.88%)

Keep in mind your results might vary. Enjoy and happy mining  :)

Do you know what is posible with stock PSU?

Honestly I wouldn't over clock at all unless you change the PSU Stock the unit draws 1080 Watts at the wall so its at its max. I noticed running stock clock just with a new PSU I noticed slightly higher hash rate and less HW errors


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: graymatter on June 06, 2014, 12:42:03 AM
I threw an EVGA 1300 in one of my S2s and have it running at 212 which shows 1077gh average in the interface, 1.1th average at the pool.  Power usage from the wall is about 1135w.  Will be setting it up to 219 next and see what the difference is.

If i can consistently get 100+gh out of each of my S2s by just throwing in a new power supply i say its worth it. 

Im curious how high we can get them on stock voltages.  Has anyone figured out any way to over volt and push the clocks higher?


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: mindtrip on June 06, 2014, 10:33:04 AM
I threw an EVGA 1300 in one of my S2s and have it running at 212 which shows 1077gh average in the interface, 1.1th average at the pool.  Power usage from the wall is about 1135w.  Will be setting it up to 219 next and see what the difference is.

If i can consistently get 100+gh out of each of my S2s by just throwing in a new power supply i say its worth it. 

Im curious how high we can get them on stock voltages.  Has anyone figured out any way to over volt and push the clocks higher?

I agree I had the 1350 PSU's laying around from some old Scypt GPU rigs so I didnt spend much. Also I see newegg has them onsale with a $40 mail in rebate http://www.newegg.com/Product/Product.aspx?Item=N82E16817194105 (http://www.newegg.com/Product/Product.aspx?Item=N82E16817194105)
Only $259.99 after mail in rebate


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: luke BTC on June 06, 2014, 02:21:26 PM
Hi ,

I have an additional 750W that i plunged in to to make 1750w. An for extra cooling iv just layed 4 fans on top of the boards .

How to go about overclocking even more .What is the algo for frequency value seems like random numbers and some have letters ?

The chip frequency seems self explanatory.

And then Their is the time out .Is this seconds ?

To go to the next level up from  219 would be complete guess work for me .


  #option 'freq_value'     '?'  #225M
    #option 'chip_freq'      '225'
    #option 'timeout'        '?'

Thanks ever so much look forward to the help

~Luke


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: mindtrip on June 06, 2014, 04:40:14 PM
Hi ,

I have an additional 750W that i plunged in to to make 1750w. An for extra cooling iv just layed 4 fans on top of the boards .

How to go about overclocking even more .What is the algo for frequency value seems like random numbers and some have letters ?

The chip frequency seems self explanatory.

And then Their is the time out .Is this seconds ?

To go to the next level up from  219 would be complete guess work for me .


  #option 'freq_value'     '?'  #225M
    #option 'chip_freq'      '225'
    #option 'timeout'        '?'

Thanks ever so much look forward to the help

~Luke


I think the settings for 225 are already in that config file although when i tried to use it the HW error rate was extremely high so something could be off, I suspect those other settings are just left overs from the S1's config files


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: luke BTC on June 07, 2014, 12:01:29 PM
yep,

 I did try the 225 settings from the old antminer S1. There were around 4000 HW errors.Where to work out the % in HW.

A classic CPU over clock is adjust voltage with chip frequency .I wonder if the  "freq_value"  is actually voltage  adjuster?

Once i learn what exactly these values are.Then i will commence overclock.It seems quite logical seen as they are the same chips as S1 then it would be very easy to get 2TH and more i would think that the voltage  would double to 2000w on 2TH.

FAN UPGRADE :The only 140mm x 38mm fans i can find .

http://www.ebay.co.uk/itm/140mm-Silverstone-SST-FHP141-140x140x38mm-FHP-Series-Black-Case-Fan-/360936122720?pt=UK_Computing_Case_Fans&hash=item5409782960

EXTRA CHIP COOLING FINS :

http://www.aliexpress.com/item/Free-Shipping-1000pcs-8-8x8-8x5mm-Heatsink-Aluminum-Heat-Sink-Heat-Sink-for-Electronics-Computer-Transistor/1874592078.html

Thanks
~Luke


 



   



Title: Re: Antminer S2 Support and Overclocking Thread
Post by: CoinDev on June 17, 2014, 02:45:57 AM
it looks like the freq_value is in hex.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: mindtrip on June 17, 2014, 12:52:36 PM
it looks like the freq_value is in hex.


Has anyone tested any higher settings with success? if so let me know so I can update this thread for others to try out. I am running stable at 1.11TH for over a week less than 0.45% HW errors


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: luke BTC on June 19, 2014, 03:59:17 PM
No,

You did a really great job over clocking to 218 any more than that even with exra cooling gets to hot .Yes please share you setting


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: mindtrip on June 19, 2014, 07:49:18 PM
No,

You did a really great job over clocking to 218 any more than that even with exra cooling gets to hot .Yes please share you setting

I agree I see this as the best stable over clock that wont overload the hardware


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: letuslook on July 02, 2014, 08:05:49 AM
What would be the correct settings for the 218 overclock?

~ Luc


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: mindtrip on July 05, 2014, 09:14:00 PM
What would be the correct settings for the 218 overclock?

~ Luc

    option 'freq_value'     '5102'  #219M
    option 'chip_freq'      '218.75'
    option 'timeout'        '38'


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Hyacin75 on July 14, 2014, 05:06:30 PM
The timeouts in the stock asic-freq.conf appear to *decrease* as the frequency goes up ... but here you've got them going up with frequency ... has anyone played with timeout values on the S2 much?  I'm just starting to myself, but from what I'm seeing, 218.75/35 yields a better average hashrate than 218.75/38 ...

Also curious what people are seeing when they push further than that?  I've got a 1250W PSU in there now, and the chips sure don't seem hot as is stated in this thread at 218.75 ... they're all sitting very comfortably at < 60 degrees in an air conditioned bedroom ... what are people defining as "too hot" when they're trying to go further than that?


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: letuslook on July 14, 2014, 09:21:23 PM
Getting my corsair ax1200w also soon and the chips are the same as with the s1 so you can check those settings aswel. Will update soon to post my findings


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: yoleng on July 14, 2014, 11:18:05 PM
 ::) great instructions...though mine never went above 212 without stability issues.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: mindtrip on July 15, 2014, 03:24:20 AM
::) great instructions...though mine never went above 212 without stability issues.

thank you, as usual with overclocking individual results vary I have 2 units that over clocked well 1 didnt improve much just a big increase in HW errors


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Hyacin75 on July 15, 2014, 02:14:12 PM
::) great instructions...though mine never went above 212 without stability issues.

Wow.  Shame.

I threw a Corsair 1250 (non-i, just the regular not even modular version) in and I'm rocking 218 and ~1.11 Th/s VERY happily.  I left the 6th PCI-E connector off the backplane, the same as how the unit was shipped to me ... not sure if having it connected was doing anything, but when one of my cards appeared dead I disconnected it as part of my troubleshooting and everything was happy so I just left it disconnected (and after reseating and moving cards around that card came back to life thankfully) ...

Thanks for the tip about them being the same chips as the S1!  I think I saw a 225 S1 setting somewhere so I'll try the magic hex from that to see if I can get her rocking at 225 ... will report back!  :)


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Hyacin75 on July 15, 2014, 03:09:58 PM
Thanks for the tip about them being the same chips as the S1!  I think I saw a 225 S1 setting somewhere so I'll try the magic hex from that to see if I can get her rocking at 225 ... will report back!  :)

Yeah, 225/6386 thus far (30 minutes in) is giving me about the same hashrate (0.85% increase), and more than double the hardware errors (7.43% vs. 2.33%) ...

The only hex I could find for the frequency in the middle (221.88), 6306, doesn't take on the S2, so I guess I'm sticking with 218.75 until they release their official upgrade path ...


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Hyacin75 on July 15, 2014, 06:39:35 PM
I also need a way to shut this thing up if anyone knows one!

I'll desolder the speaker if someone can tell me what kind of screw head I need to pull the LCD board out ... though obviously I'd prefer a method in software, which survives reboots ...

I run this thing in my home.  My Internet does go out every once in a while ... usually in the middle of the night, and "BEEP BEEP BEEP" - this bloody box lets everyone in the house know when it does ...

The checkbox in the web interface does literally nothing ... literally - when cgminer starts up it says it has no idea what the option which that toggles even means ...

Any help would be greatly appreciated ...


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: major job on July 16, 2014, 07:29:15 PM
Great job! thanks. Scored a very cheap ocz 1250w and the money saved went on a  fan upgrade - 4x  140mm Akasa  Viper Fans (S-FLOW)
Bloody hell! what a difference in noise level and air moved... remember the jet fighter you hear when the ant miner powers on? well thats flown..
would really recommend a fan upgrade as part of the overclocking ;D


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: mindtrip on July 19, 2014, 12:15:17 PM
Mine have been running cool enough for weeks on the stock fans but I have a few extra really high CFM fans laying around maybe ill try changing them out on one miner and compare temps over a few days. If anyone has discovered any settings that worked for them that are not in this thread let me know so I can update the main page


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on July 25, 2014, 09:11:50 AM
Maybe someone knows why my network and pool settings resetting to default every time I reboot my S2? Is there any file(s) in which I can configure my personal settings by hands (since the system does not save settings automatically)?


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: nordine on July 25, 2014, 01:33:26 PM
Hi !
If you upgrage to the latest firmware from Bitmain website you can get rid of that problem.
The SD card where the boot image is stored is corrupted due to Bitmain's deployment process maybe.
I did it on 2 units, it worked, problem solved.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on July 25, 2014, 02:32:08 PM
Kano ?
Kano, works on the cgminer team.
Edit: here's his github page for the S2: https://github.com/kanoi/cgminer-binaries/tree/master/AntS2
I have upgraded my miner with latest Kano's firmware (because of specially compiled CGminer there).


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Hyacin75 on July 25, 2014, 02:42:20 PM
Kano ?
Kano, works on the cgminer team.
Edit: here's his github page for the S2: https://github.com/kanoi/cgminer-binaries/tree/master/AntS2
I have upgraded my miner with latest Kano's firmware (because of specially compiled CGminer there).

Oh thank goodness, a fix for the beeping! Loving this firmware already!


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Hyacin75 on July 26, 2014, 02:18:30 AM
WOW, hashrate on multipool.us has gone up a LOT with this Kano firmware -

http://www.ipninja.net/kano.jpg

<3


I was getting about an 1150 average on multipool.us before, and somewhere in the 1020-1050 area on Nicehash ...

Not sure if it's a coincidence or not, but I have NEVER seen an average that high after it settles down after the first few minutes, so I'm guessing not ...

That's @ 218 MHz btw ...


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: d2dtk on July 26, 2014, 07:58:07 AM
WOW, hashrate on multipool.us has gone up a LOT with this Kano firmware -

http://www.ipninja.net/kano.jpg

<3


I was getting about an 1150 average on multipool.us before, and somewhere in the 1020-1050 area on Nicehash ...

Not sure if it's a coincidence or not, but I have NEVER seen an average that high after it settles down after the first few minutes, so I'm guessing not ...

That's @ 218 MHz btw ...

Are you using the stock PSU? Also how are the hardware errors looking?


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Hyacin75 on July 27, 2014, 05:37:36 AM
Are you using the stock PSU? Also how are the hardware errors looking?

No, a 1250w Corsair ...

Hardware errors are around 24k an hour which didn't seem all that much worse than at stock clocks ...


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: d2dtk on July 27, 2014, 07:17:47 AM
Are you using the stock PSU? Also how are the hardware errors looking?

No, a 1250w Corsair ...

Hardware errors are around 24k an hour which didn't seem all that much worse than at stock clocks ...

So you did the firmware update and the clock mod. I'm thinking of doing the Kano upgrade but I haven't seen much info about the benefitsother then a modern version of cgminer.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: mroth7684 on July 27, 2014, 02:10:17 PM
Downside to using kano firmware is it overwrites all configurations files every reboot. Which makes the pools point back to his. I had deleted all the pools and only put in mine as the first and then last night after 24+ hours of running I noticed one of kano's pools got written into the second slot again and it was mining for him for a couple hours. I don't know what happened; could have just been a 1 time glitch/bug.

I tried just installing his version of cgminer 4.3.5 onto the original firmware but it gets overwritten back to 3.10 when it reboots.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Hyacin75 on July 28, 2014, 10:28:16 AM
Yeah, the increased hashrate on multipool.us with Kano's is coming at a big price for me ... 59.85% rejects on Nicehash vs 3.2% at multipool (I flip between both based on the price at Nicehash) ...

Code:
 [2014-07-27 21:47:48] Rejected 3235311f Diff 1.3K/512 AS2 0 pool 0 (Invalid ntime rolling.)
 [2014-07-27 21:47:50] Accepted 0963b632 Diff 6.98K/512 AS2 0 pool 0
 [2014-07-27 21:47:52] Accepted 0eaf3303 Diff 4.46K/512 AS2 0 pool 0
 [2014-07-27 21:47:53] Accepted 2f8a9177 Diff 1.38K/512 AS2 0 pool 0
 [2014-07-27 21:47:55] Rejected 1cc9bed3 Diff 2.28K/512 AS2 0 pool 0 (Invalid ntime rolling.)
 [2014-07-27 21:47:56] Accepted 7f3e1e32 Diff 515/512 AS2 0 pool 0
 [2014-07-27 21:47:58] Rejected 59d3794f Diff 730/512 AS2 0 pool 0 (Invalid ntime rolling.)


Looking at my graphs on Nicehash, this was not happening with the old firmware -

http://www.ipninja.net/nh_rejects.jpg

The red part is the rejected hashrate ...

So it comes down to -

~5% better hashrate on multipool but losing out on high priced periods on Nicehash with Kano's firmware, or, back to the status quo with an acceptable hashrate on both with the stock firmware ...


Bitmain support pointed me to the latest S3 firmware (yes, S3 firmware) to resolve the beeping issues ... perhaps I'll give that a go ...


Update: Just got home and my room is extremely hot, and the AC has been on all weekend, and it's maybe 18 degrees outside ... the room did not get this hot before ... I can't say 100% for sure, but I think the Kano build is also making the box run a LOT hotter, because nothing else in this room has changed in the last week ...

Update 2: Can't flash S3 firmware onto the S2, it's a .bin file and the S2 is looking for a .tar file


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Hyacin75 on July 28, 2014, 01:28:19 PM
Back to stock, stuck with the beeping again, but hey, at least I can mine with Nicehash ...

nicehash - 15m avg 1040 gh/s - 8.34% rejects
multipool.us - 15m avg 1099 gh/s - 0.22% rejects

It feels like the room is cooling off too ... I REALLY think Kano's firmware runs hotter for some reason ... which does make some sense given the massive increase in hashrate I was seeing ...


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: d2dtk on July 28, 2014, 05:47:00 PM
Back to stock, stuck with the beeping again, but hey, at least I can mine with Nicehash ...

nicehash - 15m avg 1040 gh/s - 8.34% rejects
multipool.us - 15m avg 1099 gh/s - 0.22% rejects

It feels like the room is cooling off too ... I REALLY think Kano's firmware runs hotter for some reason ... which does make some sense given the massive increase in hashrate I was seeing ...

Are you still pushing it at 218mhz or did you drop that back down to normal too? I'm able to run at 200mhz on stock psu and no addtional heating problems.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Hyacin75 on July 28, 2014, 05:54:12 PM
Back to stock, stuck with the beeping again, but hey, at least I can mine with Nicehash ...

nicehash - 15m avg 1040 gh/s - 8.34% rejects
multipool.us - 15m avg 1099 gh/s - 0.22% rejects

It feels like the room is cooling off too ... I REALLY think Kano's firmware runs hotter for some reason ... which does make some sense given the massive increase in hashrate I was seeing ...

Are you still pushing it at 218mhz or did you drop that back down to normal too? I'm able to run at 200mhz on stock psu and no addtional heating problems.

218 ... I can't break 1 TH average at stock so I won't leave it there no matter how hot my room gets!  :)

Haven't spent any considerable amount of time at the speeds in between ... I had an extra PSU lying around so the upgrade didn't cost me a cent ... I'm not sure I'd go spend money on one if I didn't have it sitting around though because they may tell us in two months that as part of the 2 TH upgrade kit we need to go buy x/y or z and any purchases made today could be rendered useless :-/


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on August 01, 2014, 03:00:15 AM
Guys, please make this clear - have you achieved more hashing power (stable long-term h.p. both at miner's and pool's side with normal reject/discarded/stale/HW rate) after S2 overclocking or not?..  ??? Also - what firmware do you use, what clocks have you set?

I will today replace 2 big fans with Noctua NF-A14 PWM (to see whether it will work more quiet having the same temperature), replace PSU with Chieftec 1250 W and try to OC it.  :P


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Hyacin75 on August 01, 2014, 03:37:35 AM
Guys, please make this clear - have you achieved more hashing power (stable long-term h.p. both at miner's and pool's side with normal reject/discarded/stale/HW rate) after S2 overclocking or not?..  ??? Also - what firmware do you use, what clocks have you set?

~1.08 TH average over several hours on nicehash, 218 clocks, latest stock firmware
1.12 TH average over several hours on multipool.us, 218 clocks, latest stock firmware
1.21 TH average over one hour on multipool.us, 218 clocks, Kano's firmware
CAN NOT use nicehash with Kano's firmware (invalid ntime errors)

All with a Corsair 1200W.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: mroth7684 on August 01, 2014, 11:37:35 AM
Guys, please make this clear - have you achieved more hashing power (stable long-term h.p. both at miner's and pool's side with normal reject/discarded/stale/HW rate) after S2 overclocking or not?..  ??? Also - what firmware do you use, what clocks have you set?

I will today replace 2 big fans with Noctua NF-A14 PWM (to see whether it will work more quiet having the same temperature), replace PSU with Chieftec 1250 W and try to OC it.  :P

Mine runs silent. I swapped my fans for 8x Prolimatech PRO-BV14 which are only 18dba. Akasa makes a higher CFM fan at 24dba which might be better but I'm not sure how loud that would be. I pointed all 4 side case fans inward and removed the case and put the other 4 directly on top of the boards to blow the hot air upwards. My max temp is 53c


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on August 01, 2014, 01:02:55 PM
Well, after my modding attempt I can conclude that Noctua NF-A14 PWM is not a proper choise (I replaced 2 on the front). Temperatures of all boards rised to 2-3 degrees. But these fans are quiet, definetely.  8)

Unfortunately new PSU Chieftec GPM-1250C refused to start (both connected to miner's MB and and standalone), so I will try to exchange it tomorrow or perform moneyback.... And I was not smart enough to check it before replacing...  >:(


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on August 02, 2014, 07:40:34 AM
My S2 is working on 212 MHz for last 4+ hours on stock PSU. Temperature of several boards have rised for 1 degree. There are much less discarded, stale shares and HW errors, but this may depend on router's firmware replace.  ::)

At pool side I see about 5-7% of hash speed increase. Need more time to observe.

Update: after some strange hangup yesterday I did a power reset, and all my settings has reverted back to default factory settings, in spite that I did everything as described in first post of this thread... Files in both /config and /etc folders are in their pristine state...  ??? How?..


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on August 06, 2014, 02:06:54 PM
Have just replaced stock PSU with Corsair AX1200i and overclocked a miner to 218 MHz. Seems to be OK, without any significant HW/rejects.

Does anyone know how to avoid resetting of configuration files during reboot?.. Copying it to /etc folder doesn't help at all, anytime I shutdown or reboot my S2 I forced to configure it again from it's factory settings...  >:(


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Hyacin75 on August 06, 2014, 03:10:41 PM
Have just replaced stock PSU with Corsair AX1200i and overclocked a miner to 218 MHz. Seems to be OK, without any significant HW/rejects.

Does anyone know how to avoid resetting of configuration files during reboot?.. Copying it to /etc folder doesn't help at all, anytime I shutdown or reboot my S2 I forced to configure it again from it's factory settings...  >:(

Kano's?

It's built on an earlier factory image that had that same bug ... no fix until either he releases an updated version with the latest stock fixes incorporated, or we get a new version through the official channel with his fixes incorporated  :-\

Rock and a hard place ...

On the bright side, for me, Nicehash has made some changes on their end and Kano's firmware now plays nicely with them ... I think I'm going to do some scripting on my GPU miner to monitor the S2 w/ Kano's firmware and when it resets to stock, put my config back on it and restart cgminer ...


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Hyacin75 on August 06, 2014, 04:17:05 PM
I think I'm going to do some scripting on my GPU miner to monitor the S2 w/ Kano's firmware and when it resets to stock, put my config back on it and restart cgminer ...

Code:
#!/usr/bin/perl

use strict;

my $s2pooldata = `echo "pools|" | nc 192.168.1.99 4028`;
chomp($s2pooldata);

if ( $s2pooldata =~ /btcguild/ ) {
        system("sshpass -p 'admin' scp -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no s2-cgminer.conf root\@192.168.1.99:/config/cgminer.conf 2>/dev/null");
        system("sshpass -p 'admin' ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no root\@192.168.1.99 /etc/init.d/cgminer.sh stop 2>/dev/null");
        sleep 5;
        system("sshpass -p 'admin' ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no root\@192.168.1.99 /etc/init.d/cgminer.sh start 2>/dev/null");
}

Requires perl, obviously, sshpass which on ubuntu can be installed with "sudo apt-get install sshpass", and nc which on ubuntu can be installed with "sudo apt-get install netcat-openbsd" ...

Save it as whateveryoudlike.pl and add it to your crontab to run every minute or five minutes or whatever you'd like (chmod 755 after creating the file, obviously)

If you use btcguild in your config file, other things you can look for to see if it's flipped back to (Kano) stock are -

nezumikun.kant
167.160.36.2
juros_kant
stratum.ozco.in

And as you can see you have to have the desired s2 config file in the same directory as the script, and named s2-cgminer.conf ... it'd probably be wise to update that to use a full path ...

This is for stock clocks, just duplicate the scp line and update the file name to asic-freq.config if you want to copy over a custom clock file as well.  You can add another ssh line as well if desired to copy it from /config to /etc.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on August 07, 2014, 02:17:11 AM
Oh... Too complicated.  ;D It looks easier to install latest Bitmain's firmware... And all my PCs either at home and at work are under Win7.  8)

I see the strange thing after an OC. At triplemining.com I see S2's speed 982 GH/s, while web-GUI shows me 1482 GH/s. I believe I should trust to the pool, right?.. Looks like my S2 was working better at 212 Mhz...  :-\ Now let's try 215. (Upd: 1090-1100 GH/s at triplemining' side, accepted almost equals to HW errors in web GUI, but this is not a problem AFAIK).


Voltage(V)Core Frequency(MHz)Hash Rate(GH/s)Current(A)Power Consumption(W)
Power Efficiency(J/GH)
0.75
200
1.60
1.423
1.07
0.681
0.85
250
2.00
1.993
1.69
0.847
1.00
312.5
2.50
2.821
2.82
1.128
1.10
350
2.80
3.359
3.70
1.32
1.25
400
3.20
4.205
5.26
1.643
But if these chips are able to run at frequency up to 400 Mhz, then why in AntMiner S2 they are running at 196 Mhz by default and can't run higher than 218 without issues?.. I hurriedly tried to uncomment a 250 Mhz settings, but S2 won't work with it. After shutting down miner I even saw a "-------" line and I thought that I burned up one board, but it fortunately became normal after a while... Sigh...

Maybe someone who is familiar with PCBs design could find a way (replacing some resistors, for example (http://www.reddit.com/r/BitcoinMining/comments/1wj9td/experiments_in_overclocking_an_antminer_u1/)) to make S2's chips run at higher frequencies.... But maybe they can't go above 218 (or 225? Has anyone tried it?..) just because of hardware design of S2's boards, it's DC circuits or something...


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: d2dtk on August 07, 2014, 07:24:39 AM
Maybe the chips need more then 1200w to get them pass 225mhz


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on August 07, 2014, 07:43:44 AM
I have both Corsair AX1200i installed and the stosk Enermax PSU. 1200+1000 W. Is this enough? I can try to connect both these PSUs. But I'm afraid to brick my S2. )

p.s. I'll ask Bitmain via e-mail about it.  ::)


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: d2dtk on August 07, 2014, 07:59:44 PM
I have both Corsair AX1200i installed and the stosk Enermax PSU. 1200+1000 W. Is this enough? I can try to connect both these PSUs. But I'm afraid to brick my S2. )

p.s. I'll ask Bitmain via e-mail about it.  ::)

I've wondered the same thing. If it is possible to connect two PSU units I would imagine more power for the chips. Might be possible that you could do half the boards on one new PSU then others on the Original.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on August 08, 2014, 01:50:55 AM
~1.08 TH average over several hours on nicehash, 218 clocks, latest stock firmware
1.12 TH average over several hours on multipool.us, 218 clocks, latest stock firmware
1.21 TH average over one hour on multipool.us, 218 clocks, Kano's firmware
CAN NOT use nicehash with Kano's firmware (invalid ntime errors)
As I understood we can run Kano's compiled cgminer under latest stock Bitmain's firmware. We just need some linux geek who has a little free time to try it.  ::)

Yeah, 225/6386 thus far (30 minutes in) is giving me about the same hashrate (0.85% increase), and more than double the hardware errors (7.43% vs. 2.33%) ...
What was your value for 'timeout' and where did you get it from?

p.s. by the way I have asked (https://bitcointalk.org/index.php?topic=28402.msg8242162#msg8242162) kano about his (or maybe her?  ::) ) plans about new firmware for S2 (or maybe even for S3) and I hope I will not be the one who is ready to donate him for this job...


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Hyacin75 on August 08, 2014, 03:09:53 AM
As I understood we can run Kano's compiled cgminer under latest stock Bitmain's firmware. We just need some linux geek who has a little free time to try it.  ::)

I couldn't get it to work even with all the linking and everything else mentioned in Kano's README, it would hang after launch ... even if you could get it to work, you'd lose all your changes after a reboot (since you either have to overwrite cgminer or modify /etc/init.d/cgminer.sh), so you'd might as well just be running Kano's firmware ...

Yeah, 225/6386 thus far (30 minutes in) is giving me about the same hashrate (0.85% increase), and more than double the hardware errors (7.43% vs. 2.33%) ...
What was your value for 'timeout' and where did you get it from?

I don't recall ... I started with the values at the top of this thread but the timeouts seemed to go in the wrong direction compared to the stock config, and to a degree, logic (getting longer with higher clocks), so I flipped them around and use 36 on 218 ... I probably used 35 on 225 ...


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: d2dtk on August 08, 2014, 06:48:11 AM
What exactly do the timeouts do for the chips? I'm doing 200mhz @ 36 for timeout because 40 seemed to high


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Hyacin75 on August 08, 2014, 08:32:06 AM
Modified with a time of day asic speed schedule -

Code:
#!/usr/bin/perl

use strict;

my %schedule = (
        0 => [ 218, 218,218,218,218,218,218, 218,218,218,218,218,218, 218,218,206,206,206,206, 206,218,218,218,218, ],
        1 => [ 218, 218,218,218,218,218,218, 218,218,218,218,218,218, 218,218,206,206,206,206, 206,218,218,218,218, ],
        2 => [ 218, 218,218,218,218,218,218, 218,218,206,206,206,206, 206,206,196,196,196,196, 196,206,206,206,196, ],
        3 => [ 196, 196,196,196,196,196,196, 196,196,206,206,206,206, 206,206,196,196,196,196, 196,206,206,206,196, ],
        4 => [ 196, 196,196,196,196,196,196, 196,196,206,206,206,206, 206,206,196,196,196,196, 196,206,206,206,196, ],
        5 => [ 196, 196,196,196,196,196,196, 196,196,206,206,206,206, 206,206,206,206,206,206, 206,218,218,218,218, ],
        6 => [ 218, 218,218,218,218,218,218, 218,218,218,218,218,218, 218,218,206,206,206,206, 206,218,218,218,218 ],
);

my ($hour, $wday) = (localtime(time))[2,6];

my $s2pooldata = `echo "pools|" | nc 192.168.1.99 4028`;
chomp($s2pooldata);
my $currclock = `sshpass -p 'admin' ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no root\@192.168.1.99 ps w | grep 115200 | grep bitmain | grep -v grep | tr -s ' ' ' ' | cut -d'-' -f2- | cut -d' ' -f4 | cut -d':' -f5`;
chomp($currclock);

my $RESTART = 0;

if ( $s2pooldata =~ /btcguild/ ) {
        system("sshpass -p 'admin' scp -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no /path/to/s2-cgminer.conf root\@192.168.1.99:/config/cgminer.conf");
        $RESTART = 1;
}

if ( $currclock !~ /${$schedule{$wday}}[$hour]/ ) {
        my $asicfile = "asic-freq.config." . ${$schedule{$wday}}[$hour];
        system("sshpass -p 'admin' scp -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no /path/to/$asicfile root\@192.168.1.99:/config/asic-freq.config");
        system("sshpass -p 'admin' ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no root\@192.168.1.99 cp /config/asic-freq.config /etc/asic-freq.config");
        $RESTART = 1;
}

if ( $RESTART == 1 ) {
        system("sshpass -p 'admin' ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no root\@192.168.1.99 /etc/init.d/cgminer.sh stop");
        sleep 5;
        system("sshpass -p 'admin' ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no root\@192.168.1.99 /etc/init.d/cgminer.sh start");
}


In my case I use it to keep my room from getting insanely hot while I'm here and more specifically, while I'm trying to sleep (like I would and should be right now if the room wasn't insanely hot from it running at 206, lol) ... could be useful for anyone on time of day hydro billing though if they wanted to run it at lower clocks during the more expensive times ...


This requires, for my specific schedule values -

s2-cgminer.conf
asic-freq.config.196
asic-freq.config.206
asic-freq.config.218

files to be in the current directory or an absolute path to them specified ...


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: d2dtk on August 10, 2014, 04:41:27 AM
Cleaned and applied Antec Formula 6 Nano diamond on the bottom 2 boards but ran out before I could compete the other 8. Huge drop in temperature,  usually stayed about 49-52c now 45-47c.

http://i62.tinypic.com/28hol5l.jpg


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on August 11, 2014, 02:46:11 AM
Then for you it's time to overclock your S2.  8)


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: d2dtk on August 11, 2014, 03:21:56 AM
Then for you it's time to overclock your S2.  8)

I had it running at 200 then at 212 but reset it to stock when I did the boards. Only have the original PSU so I can only push it so far before it's all hardware errors :/


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on August 11, 2014, 08:29:33 AM
225 Mhz, 1,207.93 GHash/s at ozco.in pool. Continue to monitor.  8)


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: bernard75 on August 13, 2014, 12:44:04 PM
225 Mhz, 1,207.93 GHash/s at ozco.in pool. Continue to monitor.  8)
Thats the whole pool, right? ;)


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on August 18, 2014, 06:44:53 AM
Sure it's only my S2.  ::)
But now I'm at slush's because of better ping.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: d2dtk on August 20, 2014, 05:33:39 AM
Then for you it's time to overclock your S2.  8)

I'm officially over clocked and running a 1300 watt PSU from EVGA their Supernova Model. I'll post results one it steady itself out at 219mhz.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: mindtrip on August 20, 2014, 08:44:17 PM
Then for you it's time to overclock your S2.  8)

I'm officially over clocked and running a 1300 watt PSU from EVGA their Supernova Model. I'll post results one it steady itself out at 219mhz.

Good choice on the Power supply this is one of my favorites plus 10 year warranty cant go wrong


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: d2dtk on August 22, 2014, 06:36:37 AM
Pushing it at 225mhz now. Timeout set to 30 seconds. Anyone have better results adjusting the timeout seconds?


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: d2dtk on August 24, 2014, 07:11:44 PM
Pushing the s2 a little harder and I'm glad I re-did the heat sinks or my temps would be extremely high

Pool says I'm averaging between 1.10-1.20TH/s

High hardware error rate but kind of low difficulty rejects.

Hardware Error Rate - 3.579 %
http://www.coincadence.com/antminer-s1-hardware-error/ (http://www.coincadence.com/antminer-s1-hardware-error/)

http://i59.tinypic.com/30cuoo8.jpg


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on September 07, 2014, 04:55:42 AM
I'm tired of waiting when the new firmware for S2 will be released....


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: d2dtk on September 07, 2014, 05:49:17 AM
I'm tired of wait when the new firmware for S2 will be released....

I keep checking the website and github everyday :/


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on September 08, 2014, 06:00:50 PM
Well, at least we have a cgminer update for S3s: https://bitcointalk.org/index.php?topic=671189.msg8731716#msg8731716 (https://bitcointalk.org/index.php?topic=671189.msg8731716#msg8731716)


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: d2dtk on September 08, 2014, 10:22:14 PM
Well, at least we have a cgminer update for S3s: https://bitcointalk.org/index.php?topic=671189.msg8731716#msg8731716 (https://bitcointalk.org/index.php?topic=671189.msg8731716#msg8731716)

I wish I had me some S3 units to test and mess around with! We're all still waiting for Bitmain to update our firmware which is extremely older then the s3, I guess they only care about the new product line.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on September 08, 2014, 11:34:33 PM
Looks so.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: as4406 on September 13, 2014, 05:47:01 AM
it looks like the freq_value is in hex.


Has anyone tested any higher settings with success? if so let me know so I can update this thread for others to try out. I am running stable at 1.11TH for over a week less than 0.45% HW errors


good idea, but i haven't tested it!


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: new force on September 18, 2014, 02:25:47 AM
Since there is scattered info on the Antminer S2's I thought it would be a good idea to start a thread dedicated to the support and overclocking of the newer S2's

So Far I have replaced my PSU with a newer Enermax 1350Watt Platinum rated as I believed the stock PSU was pushed to close to the limit, this should add some additional head room to OC the boards

My first attempt to SSH into the unit has failed look like the SSH password is not the same as the web interface does anyone know this? SOLVED

WEB LOGIN root
WEB PASSWORD root

SSH LOGIN root
SSH PASSWORD admin

OVERCLOCKING STEPS *PLEASE NOTE THIS IS DONE AT YOUR OWN RISK* IF THIS WORKS FOR YOU PLEASE DONATE FOR THE TIME I INVESTED IN THIS IF YOU FEEL IT WILL MAKE YOU MONEY :)

Step 1 Using Putty  or another program SSH into your Miner
Step 2 Click "YES" on the "Security Alert" that pops up
Step 3 Login with User: root Password: admin
Step 4 Type "cd /config"
Step 5 Type "vi asic-freq.config
Step 6 Hit the "I" key to edit the file
Step 7 Scroll the the bottom and copy this code and click in the SSH window to paste it (I suggest you start with the 212M Settings run it for a few hours make sure your miner is stable then work your way up)
    option 'freq_value'    '5082'  #212M
    option 'chip_freq'     '212.5'
    option 'timeout'       '36'

    #option 'freq_value'    '6206'  #216M
    #option 'chip_freq'     '215.625'
    #option 'timeout'       '37'

    #option 'freq_value'     '5102'  #219M
    #option 'chip_freq'      '218.75'
    #option 'timeout'        '38'

Step 8 be sure to add "#" in front of everything listed on the 196M line
Step 9 Hit "esc" then type ":wq"
Step 10 (IMPORTANT) type "cp asic-freq.config /etc/asic-freq.config"
IF YOU SKIP THIS STEP ALL SETTINGS WILL BE LOST WHEN YOU POWER CYCLE THE MINER
Step 11 Now Login to the web interface of your miner and go to the miner config tab and click "save and apply" this will restart cgminer with the new settings

Based on my testing here is how my miner performed at each speed

212mhz     1083GH     (+56 Watts)(+80GH Speed)(HW Error 0.22%)
216mhz     1098GH     (+71 Watts)(+95GH Speed)(HW Error 0.39%)
219mhz     1114GH     (+90 Watts)(+111GH Speed)(HW Error 0.88%)

Keep in mind your results might vary. Enjoy and happy mining  :)

no freq value... ???


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Hyacin75 on September 18, 2014, 06:48:07 PM
I just built 4.6.0 on my S2 to try to resolve an issue I'm having with multipool.us (didn't work btw)


Code:
 cgminer version 4.6.0 - Started: [2014-09-18 18:16:32]
--------------------------------------------------------------------------------
 (5s):1.643T (1m):1.399T (5m):1.144T (15m):892.6G (avg):1.070Th/s
 A:371712  R:18432  HW:8380  WU:15069.9/m
 Connected to stratum.westhash.com diff 1.02K with stratum as user me
 Block: 7cb75f9f...  Diff:232M  Started: [18:42:26]  Best share: 2.09M
--------------------------------------------------------------------------------
 [U]SB management [P]ool management [S]ettings [D]isplay options [Q]uit
 0: AS2 0       : 51/ 54C 1800R           | 3.239T / 1.078Th/s WU:15069.9/m
--------------------------------------------------------------------------------


There isn't really much of note in the NEWS since 4.3.5, but if anyone would like a copy just tell me where to upload it ...

NEWS since 4.3.5 with stuff relating to other hardware removed -

Code:
Version 4.6.0 - 7th September 2014

- We should not be checking for pool_unworkable in cnx_needed as it is keeping
stratum connections open on unused pools
- Properly handle lack of input when adding pool via menu
- Allow workers without passwords

Version 4.5.0 - 29th July 2014

- Reorder and document the configure options
- fix jansson include path in cgminer-api compile instructions
- Make submit_nonce2_nonce return whether the share was valid or not
- Increase the internal buffer for API response,   as "stats" command response
can grow greater than 8K
- Detach test pool thread only if we have a blocking startup

Version 4.4.2 - 17th July 2014

- Remove the use of the pthread_tryjoin_np which is currently unimplemented on
many platforms
- Fix processarg parameters loaded from a config file not being saveable
- We only use the jansson in our source tree so no need for special case
handling of older versions
- Upgrade jansson to 2.6
- Only clear sockbuf if it's been allocated
- Fix missing osm-led-mode support in write config
- Deal with nanosecond overflow in both directions on both addition and
subtration of timespecs
- production stats added, reset queue added
- Avoid blocking all pool testing if one pool fails to ever init
- There is no point storing the hints addrinfo in struct pool
- initialise more pool values in benchmark
- merge upstream frequency changes
- Fix an off-by-one.
- fix AntS1 breakages from AntS2 changes
- noncedup - give access to the internal stats

Version 4.4.1 - 21st June 2014

- Clean up pool failure and failover code for stratum

Version 4.4.0 - 16th June 2014

- Clear the pool idle flag in the pool test thread
- Display error message if we receive one on share rejects
- Allow zero length strings to be passed to valid_hex
- delete unused roundl definition



Oh, and it has no getwork support since it couldn't find libcurl despite it being installed, and everything I use supports stratum anyway, so I couldn't be bothered to fight with it any longer than I did trying to get it to see the libraries ...



UPDATE - Nevermind.  Absolutely TERRIBLE hashrates with it ... ~3 Gh/s on Slush's pool, and maybe 250 Gh/s on westhash ... went back to 4.3.5-s2 ...


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: d2dtk on September 18, 2014, 08:32:29 PM
UPDATE - Nevermind.  Absolutely TERRIBLE hashrates with it ... ~3 Gh/s on Slush's pool, and maybe 250 Gh/s on westhash ... went back to 4.3.5-s2 ...

Did you just rebuild cgminer or a entire firmware upgrade?


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Hyacin75 on September 18, 2014, 08:41:15 PM
Did you just rebuild cgminer or a entire firmware upgrade?

Just cgminer.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Hyacin75 on September 25, 2014, 06:29:42 PM
Oh good, so this thing hasn't come close to returning my investment, and now instead of the upgrade they promised, they want me to fork out another ~$1250 for a whole other unit to run up my hydro bills more and *hopefully* make me back the money I put into the S2 and now the new S4?!?

I believe this is where the train stops for me ... done with Bitmain.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: d2dtk on September 26, 2014, 05:12:34 AM
Oh good, so this thing hasn't come close to returning my investment, and now instead of the upgrade they promised, they want me to fork out another ~$1250 for a whole other unit to run up my hydro bills more and *hopefully* make me back the money I put into the S2 and now the new S4?!?

I believe this is where the train stops for me ... done with Bitmain.

I feel the same way. Waiting for positive news about possibly over clocking these units to 2th/s with maybe a firmware mod/volt mod.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: dudee on October 13, 2014, 06:52:48 PM
I tried oc 212M set but failed to work, I did a reset. the original power supply can handle 212Mhz?


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: klondike_bar on October 14, 2014, 03:58:25 PM
Anyone tried underclocking or undervolting these?

Wondered if anything better than 1w/gh can be achieved


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: klondike_bar on October 14, 2014, 03:59:57 PM
I tried oc 212M set but failed to work, I did a reset. the original power supply can handle 212Mhz?

No, the original supply is pushed near it's limit. For 212mhz you really need a 1200w or better supply since the power draw of 1100gh is around 1050-1150w in the psu


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: 82kevin on October 18, 2014, 02:26:52 PM
I'm hoping someone here can help me since I am a relatively new to using antminers. I have three s1's and two s3's and I just bought my first s2. I have successfully ssh into the s1's and s3's and have overclocked/underclocked without any problems, but for some reason I cannot edit the /etc/config in the s2. I open putty and enter root/admin and instead of seeing the normal welcome screen all I see is a line "root@antminer:~#", then I enter "/etc/config" and it says "-sh: /etc/config: not found". I have updated to the latest firmware from Bitmain and have rebooted several times. Any ideas what might be wrong?


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: d2dtk on October 19, 2014, 08:20:50 PM
Follow the OP

Step 2 Click "YES" on the "Security Alert" that pops up
Step 3 Login with User: root Password: admin
Step 4 Type "cd /config"
Step 5 Type "vi asic-freq.config

I'm hoping someone here can help me since I am a relatively new to using antminers. I have three s1's and two s3's and I just bought my first s2. I have successfully ssh into the s1's and s3's and have overclocked/underclocked without any problems, but for some reason I cannot edit the /etc/config in the s2. I open putty and enter root/admin and instead of seeing the normal welcome screen all I see is a line "root@antminer:~#", then I enter "/etc/config" and it says "-sh: /etc/config: not found". I have updated to the latest firmware from Bitmain and have rebooted several times. Any ideas what might be wrong?


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: fullzero on October 25, 2014, 02:07:37 PM
Anyone tried underclocking or undervolting these?

Wondered if anything better than 1w/gh can be achieved

I have stable 0.95 W/GH; but at great cost to GH/s:  9 blade S2 running 396 watts 416 GH/s


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: s2miner on October 26, 2014, 05:42:25 AM
Any news on getting a cgminer 4.x firmware upgrade for S2.
S3 upgrade is there but it broke the  miner configuration page for me.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: letuslook on October 26, 2014, 01:03:38 PM
We are all still waiting for a firmware fix / update for the antminer S2,

Looks like bitmain is not working that hard on a fix :(

~ Luc


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on October 27, 2014, 10:47:07 AM
And waiting for an upgrade kit...  >:( I couldn't use this non serious 200$ coupon...


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: MissouriMiner on October 29, 2014, 06:49:59 AM
+1 on an updated cgminer.  4.6.x would be nice. 

*** PLEASE BITMAIN provide us with a cgminer/firmware update to the S2. ***

I plan to run my S2's for quite some time.  With 1Th/s at 1W/Gh, they are still very relevant.  For example; Rockminer's biggest box only does 800Gh/s at 1000W, which is 1.25W/Gh.  My point is, the S2 still has a lot of life in it, so keep supporting it!  We NEED a CGMINER 4.6 update.  The last update was over 4 months ago.  Cgminer 3.12.0 is ancient in miner age.



Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on October 31, 2014, 07:44:37 AM
So here is new firmware for S2:

https://bitcointalk.org/index.php?topic=515448.msg9389695#msg9389695 (https://bitcointalk.org/index.php?topic=515448.msg9389695#msg9389695)

 ;D At last...


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: letuslook on October 31, 2014, 02:36:06 PM
Overclocking not really working on this firmware,..

Anyone find a way to overclock them past 200mh/s?


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: d2dtk on October 31, 2014, 10:38:33 PM
Overclocking not really working on this firmware,..

Anyone find a way to overclock them past 200mh/s?

Did you have to ssh into the unit or is it like an s3?


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: MissouriMiner on November 01, 2014, 07:27:07 AM
+1 on an updated cgminer.  4.6.x would be nice. 

*** PLEASE BITMAIN provide us with a cgminer/firmware update to the S2. ***

I plan to run my S2's for quite some time.  With 1Th/s at 1W/Gh, they are still very relevant.  For example; Rockminer's biggest box only does 800Gh/s at 1000W, which is 1.25W/Gh.  My point is, the S2 still has a lot of life in it, so keep supporting it!  We NEED a CGMINER 4.6 update.  The last update was over 4 months ago.  Cgminer 3.12.0 is ancient in miner age.



Thank you, thank you, thank you, Bitmain for the new firmware with Cgminer 4.6.1!  It is so nice to see 995 Gh/s average on my S2 mining P2Pool. 


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on November 12, 2014, 08:21:56 AM
Thank them for S2 became non-overclockable with this new firmware?.. Strange...


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: StormTheFront on November 14, 2014, 10:01:46 PM
Overclocking not really working on this firmware,..

With the S4, they have changed the location of where the Frequency settings are stored.
The file in question from the S2 remains on the S4 firmware SD, but is obsolete and useless.
Perhaps with this latest firmware they have done the same with S2.
Changed the location of the Frequency settings.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: bubbleindustry on November 21, 2014, 04:09:15 PM
Thanks for all the info here guys, I was about to ditch my S2s, this has given them some more life just for the fun value of SSH into them and playing with the ASIC freqs  ;)


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on December 22, 2014, 04:20:50 AM

Step 4 Type "cd /config"
Step 5 Type "vi asic-freq.config


Sure I have missed something, but the "vi asic-freq.config" file is empty (ls doesn't show it, it's absent there...). What's wrong with newest FW?..

p.s. also "find" command can't find it...

After all: how to overclock S2 with latest firmware by Bitmain?..


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: MissouriMiner on December 22, 2014, 05:02:31 AM

Step 4 Type "cd /config"
Step 5 Type "vi asic-freq.config


Sure I have missed something, but the "vi asic-freq.config" file is empty (ls doesn't show it, it's absent there...). What's wrong with newest FW?..

p.s. also "find" command can't find it...

After all: how to overclock S2 with latest firmware by Bitmain?..

You can now use the UI to set it (just like S3/S4/C1).  On the Miner Configuration tab, there is now Advanced Settings, next to General Settings.  Easy to miss if you're not expecting it.  There is a drop-down to select the freq.  And then the option is passed to cgminer as part of --bitmain-options.  There is a text file that contains the settings that appear in the drop-down box, but I can't recall the file name at the moment.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on December 22, 2014, 05:24:18 AM
Maximum frequency value in "Advanced settings" tab is 200, but I want more. )


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: MissouriMiner on December 22, 2014, 05:36:29 AM
Maximum frequency value in "Advanced settings" tab is 200, but I want more. )

Took me a while to find the file.  Edit this file and add the freq, if you have the values.  Or I can post them if needed.  Don't have handy right now.  They should be on this forum.  Same values as used to be in asic-freq.conf, just different format.

/usr/lib/lua/luci/model/cbi/cgminer/cgminer.lua



Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on December 22, 2014, 08:49:36 AM
 :o I can't even see the "lua" folder under /usr/lib/........


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on December 22, 2014, 09:55:12 AM
Well, who knows how to overclock the S2 after upgrade to newest FW by Bitmain?.. I neither can see asic-freq.config file, nor cgminer.lua... :confused:
Posted from Bitcointa.lk - #mOFq4XRsYZQJWE5y


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: MissouriMiner on December 22, 2014, 03:07:16 PM
:o I can't even see the "lua" folder under /usr/lib/........

Oh, dang.  I'm sorry.  That was for the S3.   Try editing "/www/pages/cgi-bin/minerAdvanced.cgi".  Near the bottom of the file.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Rabinovitch on December 23, 2014, 05:23:45 AM
I added one string there, <option value=.......</option>, but when I rebooted S2 in order to make that selection available in miner's GUI, it became unavailable. After power reset everything became normal, miner is available and hashing again, but there are no my changes in that file... They were there after :wq command...


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: MissouriMiner on December 23, 2014, 05:48:12 AM
I added one string there, <option value=.......</option>, but when I rebooted S2 in order to make that selection available in miner's GUI, it became unavailable. After power reset everything became normal, miner is available and hashing again, but there are no my changes in that file... They were there after :wq command...

The changes will not stay after a reboot. Same behavior as the S4 and C1.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: Zorg33 on February 18, 2015, 11:42:19 PM
I successfully overclocked my S2 with the newest firmware by adding the options on the Web UI with firebug.
You need to add an <option> tag with the specified 'x:y:z' values from the first post, then select it and hit save&apply.

BTW, what's the default voltage? 0.75V ? I tried 216MHz with voltage 0725 and the HW went high above 1.5% with 1090GH.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: klondike_bar on February 19, 2015, 03:53:04 AM
I successfully overclocked my S2 with the newest firmware by adding the options on the Web UI with firebug.
You need to add an <option> tag with the specified 'x:y:z' values from the first post, then select it and hit save&apply.

BTW, what's the default voltage? 0.75V ? I tried 216MHz with voltage 0725 and the HW went high above 1.5% with 1090GH.

I doubt theres actually a working voltage control - 216Mhz @stock voltage would give about the hash and error rates you have. When it was a new unit, i was pushing mine close to 1120GH at 225MHz


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: FuryFever on April 02, 2015, 12:58:28 PM
I notice there haven't been a lot of replies to this thread lately, so I'm not sure if anyone is still messing about with these Antminer S2's or not.  But, I'm having a bit of a problem with successfully overclocking my Antminer S2 that I bought a few months ago and I was hoping some pointers from this forum might get me on the right track.

I was actually overclocking my Antminer S2 with some success on the STOCK power supply (1,000 Watts Enermax).  I took the clock frequency values posted on the first page and played around with them and found I had the best luck with 216M (215.625 MHz per chip).  With this setting, I had increased my average hash rate on the miner from around 1,008 GH/s or so stock to around 1,092 GH/s overclocked.  My hardware error rate only increased to 0.96% or so (under 1%, so not bad...) and I was even getting mining pool side hash rates reported from this machine in the 1.09-1.12 TH/s range!

But, I wanted to see if I could get more out of it than that.  I had read on this thread that if you wanted to overclock the Antminer S2 more, you would need to get a bigger power supply so you could supply all the ASIC chips with more power to run them at a higher MHz clock speed.  I also read that the ASIC chips used in the Antminer S2 are the same ones that were used in the Antminer S3, but that there were fewer chips per board on the S3 and they were running at 400 MHz instead of 200 MHz like they are on the S2.  So, in my mind, I figured that if I was able to supply more voltage and wattage to the boards in my S2, theoretically I should be able to overclock the chips to 250, 300, 350, or maybe even 400 MHz and try to approach 2TH/s with my miner!

However, unfortunately that has NOT been the case!  I purchased a LEPA G1600, which is a 1,600 Watt continuous (1,700 Watt peak power) fully modular power supply to swap into my Antminer S2.  I completed the swap Tuesday night (March 31) and have been playing around with the chip frequencies and voltages since then and I just CANNOT get it to run any better than it already was on the stock power supply at 215.625 MHz chip frequency!!  What gives here?

I tried being overly ambitious at first and jumped the chip frequency right up to 250 MHz, but it would not even hash at that speed at all!  I was only getting 32-45 GH/s reporting out of the machine and I had hardware errors in the 154-175% range!  This was crazy!  How could such a relatively small increase basically break my miner and it wasn't working at all?!  I should have the power to back up this increase in chip frequency, right?  Then I tried backing it off to only 225 MHz, but that didn't seem to work much better either.  I was still getting hash rates below 100 GH/s and hardware errors in the 75-120% range.  This is ridiculous!  Then I tried backing it off to only the 219M (218.75 MHz) chip frequency and even at THAT setting I was getting a worse hash rate and more hardware errors than when I was running it at 215.625 MHz!

So, I switched my settings back to the 215.625 MHz chip frequency for now and I am still running at 1,092 GH/s average for the time being.  But it just bothers me that I was able to get that on the stock power supply and now that I have severely beefed up the power supply in it, I am unable to get any more output from my miner through overclocking it.  What gives?  Am I more limited now by cooling than I am by power?  The weird part is, even when I tried running it at 250 MHz, my reported board temperatures weren't any higher than they were at 215.625 MHz!  They were still reporting between 49 and 58 degrees Celsius, which is what they are reporting when the chips are running at 215.625 MHz as well.  So, it didn't seem like they were overheating and throttling back to me at least.  Is there some built-in limit that they programmed in so the miner won't run at all at higher frequencies?  Maybe there is a limit to how much power can be transmitted to the boards through the PCI interface and that is where it is choking now?  I notice that the Antminer S3 and S5 boards have power connectors that plug right into the ASIC boards themselves.  However, on the Antminer S2, the power plugs into the big controller board that the 10 ASIC boards plug into through PCI slots.  Could that be part of the problem?

I would really like to have my purchase of this massive power supply for my Antminer to not be for naught.  Does anyone know if it is possible to get more out of these Antminer S2's or am I pretty much at the limit of what it can do right now for some reason?  Do I need to modify the voltage field in the Advanced Miner Configuration settings in order to successfully overclock it further?  I have tried changing that setting from the stock 0725 volts to 0750, 0800, 0850, 0900, and even 0950 but it didn't seem to make any difference.  If this value is somehow actually used to do something, I'm kind of wary of setting it to a value over 1000, but something tells me that this value is not used since I don't see any difference in the way it mines regardless of what value I put in there.

Any help towards maxing out my Antminer S2 would be greatly appreciated!  Thanks in advance and I look forward to any advice you guys can give me!



Title: Re: Antminer S2 Support and Overclocking Thread
Post by: d2dtk on April 02, 2015, 03:59:42 PM
The voltage is set in the machine this limiting it from its full potential. You'd have to rebuild the boards or find a way to get different voltage regulators attached to the boards.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: FuryFever on April 02, 2015, 11:06:23 PM
The voltage is set in the machine this limiting it from its full potential. You'd have to rebuild the boards or find a way to get different voltage regulators attached to the boards.

Really?  So that voltage field in the Advanced Miner Configuration is bogus then and it does nothing?  Is it actually possible at all to modify the voltage from within the software at all (possibly as easy as just modifying some code or as complex as having to rebuild the firmware or something...) OR is the voltage regulated physically on the boards like you said?  So, I would have to buy different voltage regulators to solder into the boards then to try to overclock it further?  Has anyone ever tried this before?

Does anyone know if there are any voltage settings that could be passed to cgminer that might control this then?  Maybe that is all it would take?  One could hope at least, right?





Title: Re: Antminer S2 Support and Overclocking Thread
Post by: FuryFever on April 08, 2015, 12:01:58 PM

So, no one has tried to change the voltage regulator(s) in one of these before or knows how to do it?  It has been a while now and I haven't seen any more replies to my posts.  Just thought I'd try to bump this back up in case anyone else hasn't seen it who might be able to help out.  Thanks!


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: adaseb on April 08, 2015, 05:56:25 PM

So, no one has tried to change the voltage regulator(s) in one of these before or knows how to do it?  It has been a while now and I haven't seen any more replies to my posts.  Just thought I'd try to bump this back up in case anyone else hasn't seen it who might be able to help out.  Thanks!

Changing the VRM is not that easy. Even if you could you wouldn't make it any more efficient. It would just overheat and run loud like the S1.

Its old technology.


Also these chips are the same chips as the S1 not the S3.


Title: Re: Antminer S2 Support and Overclocking Thread
Post by: FuryFever on May 10, 2015, 01:38:56 PM
I was actually overclocking my Antminer S2 with some success on the STOCK power supply (1,000 Watts Enermax).  I took the clock frequency values posted on the first page and played around with them and found I had the best luck with 216M (215.625 MHz per chip).  With this setting, I had increased my average hash rate on the miner from around 1,008 GH/s or so stock to around 1,092 GH/s overclocked.  My hardware error rate only increased to 0.96% or so (under 1%, so not bad...) and I was even getting mining pool side hash rates reported from this machine in the 1.09-1.12 TH/s range!

But, I wanted to see if I could get more out of it than that.  I had read on this thread that if you wanted to overclock the Antminer S2 more, you would need to get a bigger power supply so you could supply all the ASIC chips with more power to run them at a higher MHz clock speed.  So, ... I purchased a LEPA G1600, which is a 1,600 Watt continuous (1,700 Watt peak power) fully modular power supply to swap into my Antminer S2.  I completed the swap Tuesday night (March 31) and have been playing around with the chip frequencies and voltages since then and I just CANNOT get it to run any better than it already was on the stock power supply at 215.625 MHz chip frequency!!  What gives here?

Any help towards maxing out my Antminer S2 would be greatly appreciated!  Thanks in advance and I look forward to any advice you guys can give me!

Well, it looks like possibly overclocking my AntMiner S2 plus the sudden heat wave that we got this week killed it.  I have no idea what happened to it, but all of a sudden I noticed on Friday that it just stopped hashing.  Now, it had been mining overclocked at 215.625 MHz and averaging 1,092 GH/s without needing a reboot for over 35 days straight.  It had been running rock solid with temps only in the 48-56 degree Celsius range.  However, this week the outside temperatures really skyrocketed all of a sudden (along with the humidity).  We had 75-80 degree Fahrenheit days all week, and then this past Friday [May 8], it hit almost 90 degrees out with like 78% humidity!  I hadn't had a chance to dig out the air conditioning units and install them yet, so my house was pretty unbearably hot.  It was around 92-93 degrees Fahrenheit upstairs and in the basement where my miners are it was around 94-95 degrees, despite the natural cooling that a basement can provide in the summer.

Because of the heat and humidity on Friday, I had a bunch of my miners go down, including my AntMiner S2.  (I also had problems with one of my CoinTerra miners and one of my AntMiner S5's also overheated and shut down.  I had one board in my S5 go over 80 degrees Celsius, so it shut down.)  However, my AntMiner S2 acted very weird.  The web interface went down so I couldn't remote into it anymore, but the miner was still on (or at least the power supply was still running).  The red light on the front of the miner was on and the display on the front of the miner was blank.  So, I unplugged the miner and left it off for about 10 minutes to cool down (as I assumed it overheated, even though I never saw the temperatures go over about 60 degrees on it).

However, when I plugged it back in, it is only mining at about HALF capacity for some reason!  The temperatures are also MUCH lower than they were - only around 42-48 degrees Celsius.  The weird thing though is that I have all 10 boards up and all 64 ASICs per board are showing as good (Displaying "o" in the ASIC Status and not "x").  So, there seems to be nothing that would be preventing the miner from running at 1 TH/s, yet I am only getting 511.6 GH/s out of it!  I have no clue what is holding it back, unless I fried some of the chips in it.  However, if that was the case, then shouldn't it be showing a bunch of dead chips in the ASIC Statuses?

Does anyone have any ideas on what could have happened, what to look for, and/or how to get this miner back working at full capacity again?  Should I just pull out and reseat the boards and try to clean it up a bit?  How can I tell what is preventing this miner from hashing at 1 TH/s?  Also, when I had to restart the miner, it reset back to 200 MHz per chip from being overclocked at 215.625 MHz, but it should still be running a lot faster than 511.6 GH/s.  It has been running for almost 2 days now since it shut down on Friday and the hashrate has still not increased on it at all and the temperatures are still only in the mid 40 degrees range.  Any help getting this miner back running again at full hashing capacity would be greatly appreciated.  Thanks!