[GUIDE] Undervolt antminer s1 [1.19W/GH at the wall]

[philipma1957]

Hello,
this is my first post, I am mining novice in BTC
I got 2 used ants S1 for cheap and I tried the voltmod to ramp up the efficiency. It works, thanks for pointing it out! Great job! 
(I live in germany and power cost is pretty horrible here: ~ 0,27€/kwh // ~ 0,36 in US$)

But I still have a few questions:

1. How do I set the frequency correctly?
option 'freq_value'    '0A81'  #275M <- What does this exactly mean? It changes with chip-freq setting as I have seen in the config.
option 'chip_freq'     '275'  <- Can I adjust it in 1MHz-steps, by simply putting in the desired freq.-value?
option 'timeout'       '45' <- This seems to be just for booting up the ant, until chips are ready?

2. HW issue: The ants show much HW (in my opinion). After running the same time with mod@~0,85V they show the following in the browser interface:
Ant#1: ACC:1381  REJ:3  HW:796 . In stock condition (180GH/s@350MHz) this ant had 0-10 HW even after running for 24h or more.
Ant#2: ACC:1364  REJ:2  HW:2699 . Also in stock condition it had almost double HW of ACC. It got about 4°Celsius hotter than Ant#1
But the pool (BTCGuild) always shows the correct speed for both ants. Now around 140GH/s each. This is calculated by the submitted ACC+REJ shares, right?
Or does the antminer also submit the #HW to the pool?

Info about my rig:
Both ants show the same fanspeed 1920rpm now and temp. 38-40°C. Room is 28°C, I will put my rig in a cooler place when everything is set up. Each blade is wired with 3 1sq-mm (~17AWG) wires for +12V and 3 for GND. Power is provided by 2 strong HP Proliant DPS-800GB (12V 82A each), which also run my ~170W scrypt rig. So I guess power is adequate.

 here is my thread on freq settings


https://bitcointalk.org/index.php?topic=589429.0

here is a you tube


 https://www.youtube.com/watch?v=72FU4Z_n0B4

use both to set at 275 or 300

[1714953630]

1714953630

[1714953630]

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[1714953630]

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[mstrongbow]

Hello,
this is my first post, I am mining novice in BTC
I got 2 used ants S1 for cheap and I tried the voltmod to ramp up the efficiency. It works, thanks for pointing it out! Great job! 
(I live in germany and power cost is pretty horrible here: ~ 0,27€/kwh // ~ 0,36 in US$)

But I still have a few questions:

1. How do I set the frequency correctly?
option 'freq_value'    '0A81'  #275M <- What does this exactly mean? It changes with chip-freq setting as I have seen in the config.
option 'chip_freq'     '275'  <- Can I adjust it in 1MHz-steps, by simply putting in the desired freq.-value?
option 'timeout'       '45' <- This seems to be just for booting up the ant, until chips are ready?

2. HW issue: The ants show much HW (in my opinion). After running the same time with mod@~0,85V they show the following in the browser interface:
Ant#1: ACC:1381  REJ:3  HW:796 . In stock condition (180GH/s@350MHz) this ant had 0-10 HW even after running for 24h or more.
Ant#2: ACC:1364  REJ:2  HW:2699 . Also in stock condition it had almost double HW of ACC. It got about 4°Celsius hotter than Ant#1
But the pool (BTCGuild) always shows the correct speed for both ants. Now around 140GH/s each. This is calculated by the submitted ACC+REJ shares, right?
Or does the antminer also submit the #HW to the pool?

Info about my rig:
Both ants show the same fanspeed 1920rpm now and temp. 38-40°C. Room is 28°C, I will put my rig in a cooler place when everything is set up. Each blade is wired with 3 1sq-mm (~17AWG) wires for +12V and 3 for GND. Power is provided by 2 strong HP Proliant DPS-800GB (12V 82A each), which also run my ~170W scrypt rig. So I guess power is adequate.

Okay, as far as changing the FREQ (frequency) of your Antminer S1...

You will need Putty to SSH into the miner...
http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html

Run Putty.exe...
Login using root@(your miner IP) [example root@192.168.1.99]
Enter your miner password (default is root)
Copy/paste the following code then press ENTER after each line (one line at a time)

Code:

cd /etc/config

vim asic-freq

This will bring you to the FREQ selection page.
Press the "I" key to enable editing.
ADD the # sign in front of the current running FREQ (it will NOT have the # sign-350 is factory)
REMOVE the # sign from the FREQ you want to run.
Press the "I" key
Type or copy paste the following code

Code:

:wq

Type "reboot" press ENTER


That's it!

[klondike_bar]

Hello,
this is my first post, I am mining novice in BTC
But I still have a few questions:
1. How do I set the frequency correctly?
option 'freq_value'    '0A81'  #275M <- What does this exactly mean? It changes with chip-freq setting as I have seen in the config.
option 'chip_freq'     '275'  <- Can I adjust it in 1MHz-steps, by simply putting in the desired freq.-value?
option 'timeout'       '45' <- This seems to be just for booting up the ant, until chips are ready?

1) its a hexcode that the chips interpret as a frequency command/modifier. There are formulas available to calculate a value, but plenty shared in the forums for common MHz intervals.
2) this is the value that the miner displays. as far as i know you could type words in that spot and still mine at whatever the hexcode frequency is
3) timeout is the expiry of hashing a specific nonce i think

ps: '#' in coding denotes that what is after it is a text comment in the file but not a program command, usually used:        function /file   #this does yadda

[doctom1981]

Great Job, it works! Thanks guys!
And I learned to like linux, nice. A bit like the good old DOS-times. 

Now I can try the 0.75V mod. Once I get my homepage/photobucket working I will share some results.

Happy mining! BTCBTCBTC

[barracuda420]

Just did a schweet hardware mod but f'd up the software stuff.  Bad things with Putty.  Think I deleted some stuff.  

[armin22]

Just did a schweet hardware mod but f'd up the software stuff.  Bad things with Putty.  Think I deleted some stuff.  I'm sure Steve Jobs had something to do with it... a$$hole. TGHD(Thank GOD He's Dead).  Will host for help.

ok dude calm down and stop thanking god that steve jobs is dead, i mean after reading his book im pretty sure he was quite an awesome guy. Second of all, instead of throwing your tits ariund, why you no tell us whats aactually wrong?

[barracuda420]

Sorry, too much drinkin...

I'm following mstrongbow's post above.  I can get to the edit part and enter the code for 275M...copy & paste does not work.  I have to enter all commands manually.  After I enter the info, I press "I" and it just enters "I" into the file.  I can't get out of the edit portion to do the ":wq" command.

The miner boots and runs for a few minutes but starts beeping b/c of all HW(errors I think) and shows no GH/s.

Tried again and seems to be working now.  Putty is a PITA to navigate through.  I watched the video but the guy was on a mac and it was different.

[pws328]

Sorry, too much drinkin...

I'm following mstrongbow's post above.  I can get to the edit part and enter the code for 275M...copy & paste does not work.  I have to enter all commands manually.  After I enter the info, I press "I" and it just enters "I" into the file.  I can't get out of the edit portion to do the ":wq" command.

The miner boots and runs for a few minutes but starts beeping b/c of all HW(errors I think) and shows no GH/s.

Tried again and seems to be working now.  Putty is a PITA to navigate through.  I watched the video but the guy was on a mac and it was different.

Ya that actually took me a little while to figure out too. Had to look up an SSH tutorial just to figure out what to do. When you press I you are in edit mode, and you can type and delete and whatnot but nothing saves. To exit edit mode, just press ESC.  Now you type in :wq to save the file you just edited, and reboot the miner.

Also gotta watch out for the SSHing and drinking   From my experience electronics and drink don't mix well!

[1bigbyte]

so I saw your video.
1) You measured R3 as about 4.68k ohms. my R3 measures 1.68kohm.
2)none the less, i did some conversions and found to achieve .85 v i need ~1.29kohms.
3) ssh in to antminer. edit /etc/config/asic-freq
disabled # on 350 mhz section
removed # on 200 mhz section.
esc. :wq
reboot antminer.

antminer works but can't discover any chips. Left it on for about 20 mins to see if it needed time to boot up and got nothing.
i measured the c17,c152, c284, c416. and they read ~.70 volts. +/- 0.01 volts. multimeter set to VDC 20.

Did you try cleaning the R3 resistor and check the value again? What were the readings for the other 7 resistors?
Double check your config via ssh and I would start with FREQ 250

Cheers!

Thank you for the help! turns out the red and black leads was pretty specific. underclocked and undervolted, ~125gh/s at 170 watts. 250mhz.

[barracuda420]

  Good thing I did the soldering part before drink #6.  Brought back many memories of modding PS2's back in the day.    ...good times.

  Software part was what messed me up.  I couldn't login with putty after so long b/c the miner shut down or wasn't available.  I panicked, thought I destroyed it = drunken, ranting post.  Plus my batch 1 S3's still haven't shipped.  

Can someone post a link or give info as to what the fields in LuCI mean?

  From what I gather reading this thread, "HW" is errors.  How are you guys calculating error %?   I'd like to tweak it a bit for the best result...I soldered pot's in and adjusted each bank to 0.847V - 0.853V.  Each Asic bank seems to have a balanced voltage output to maybe 4 Asics each(8 in the bank).   I took readings from the capacitors(referred to as "yellow thingy" in this thread) and the capacitor below it.(they are polarized and I read from the side with the bar on it, it should be the + side of the Cap).  Also, is there a way to restore the factory firmware?  I may have drunkenly f00ked it with putty.

  This machine is messed up from the start.  It had HW problems before the mod compared to the 2 newer S1's I have.  Also, my load hasn't changed much.  The board is stamped with build date 2013/12/16.

Currently seeing:
11h2m uptime
139.xx GH/s avg.
14,562 HW.
Load 2.30 2.15 2.14.
All asics showing good(0's, not x's).

Kill-o-watt readings:
Amperage: 1.46A
Wattage: 170W

  It's a lot better than the 3.3A @ stock 180 GH/s!!!

  On a sidenote, I'd like to offer my sincere apologies for the Steve Jobs comment.  I realize that some idolize him and think that he was great for technology(electronics).  As a degreed tech guy, I see him as just a great marketer and the reason we have micro-transactions aka nickel and diming for everything nowadays.  There is one thing we can all agree on...  Steve Wozniak is a genius!!  :cheers

[-droid-]

so I undervolted 1 of my S1's to 275 freq and using pencil got each resistor down under 3 (some 2.8 some 2.9)

its been a couple days and im averaging 118GH on the ant GUI

that seems low doesn't it?

both units are on a 660w seasonic platinum PSU drawing 560 watts between the 2 (one S1 is overclocked to 200GH)

only thing I can think of is I ran out of PCIE cables to power my new S3's so I pulled one from the S1 and rigged one blade on the undervolted S1 with molex to PCIE adapter (using 2 molex perif cables coming from the PSU so the adapter is not on 1 cable but 2)  I figured this would be ok considering the S1 is undervolted and drawing less power

[philipma1957]

 Good thing I did the soldering part before drink #6.  Brought back many memories of modding PS2's back in the day.    ...good times.

  Software part was what messed me up.  I couldn't login with putty after so long b/c the miner shut down or wasn't available.  I panicked, thought I destroyed it = drunken, ranting post.  Plus my batch 1 S3's still haven't shipped.  

Can someone post a link or give info as to what the fields in LuCI mean?

  From what I gather reading this thread, "HW" is errors.  How are you guys calculating error %?   I'd like to tweak it a bit for the best result...I soldered pot's in and adjusted each bank to 0.847V - 0.853V.  Each Asic bank seems to have a balanced voltage output to maybe 4 Asics each(8 in the bank).   I took readings from the capacitors(referred to as "yellow thingy" in this thread) and the capacitor below it.(they are polarized and I read from the side with the bar on it, it should be the + side of the Cap).  Also, is there a way to restore the factory firmware?  I may have drunkenly f00ked it with putty.

  This machine is messed up from the start.  It had HW problems before the mod compared to the 2 newer S1's I have.  Also, my load hasn't changed much.  The board is stamped with build date 2013/12/16.

Currently seeing:
11h2m uptime
139.xx GH/s avg.
14,562 HW.
Load 2.30 2.15 2.14.
All asics showing good(0's, not x's).

Kill-o-watt readings:
Amperage: 1.46A
Wattage: 170W

  It's a lot better than the 3.3A @ stock 180 GH/s!!!

  On a sidenote, I'd like to offer my sincere apologies for the Steve Jobs comment.  I realize that some idolize him and think that he was great for technology(electronics).  As a degreed tech guy, I see him as just a great marketer and the reason we have micro-transactions aka nickel and diming for everything nowadays.  There is one thing we can all agree on...  Steve Wozniak is a genius!!  :cheers

hw/ hw+ diff a + diff r   

139 gh and 170 watts is solid    you did well

[Trends]

so I undervolted 1 of my S1's to 275 freq and using pencil got each resistor down under 3 (some 2.8 some 2.9)

its been a couple days and im averaging 118GH on the ant GUI

that seems low doesn't it?

both units are on a 660w seasonic platinum PSU drawing 560 watts between the 2 (one S1 is overclocked to 200GH)

only thing I can think of is I ran out of PCIE cables to power my new S3's so I pulled one from the S1 and rigged one blade on the undervolted S1 with molex to PCIE adapter (using 2 molex perif cables coming from the PSU so the adapter is not on 1 cable but 2)  I figured this would be ok considering the S1 is undervolted and drawing less power

For 275 your voltage should be up around 900mv.
What is your voltage?

[taipo]

So what would happen if I just underclock to 275 without doing the pencil mod.

[philipma1957]

So what would happen if I just underclock to 275 without doing the pencil mod.

  you would hash at 140 gh and use 280 watts.


you need to understand how easy it really is to do.  2 -4 lite to medium pencil strokes on 8 resistors 4 on each side of the miner.

watts will drop from about 280 to about 170-200 depending on how perfect you got your resistors to drop.

[-droid-]

so I undervolted 1 of my S1's to 275 freq and using pencil got each resistor down under 3 (some 2.8 some 2.9)

its been a couple days and im averaging 118GH on the ant GUI

that seems low doesn't it?

both units are on a 660w seasonic platinum PSU drawing 560 watts between the 2 (one S1 is overclocked to 200GH)

only thing I can think of is I ran out of PCIE cables to power my new S3's so I pulled one from the S1 and rigged one blade on the undervolted S1 with molex to PCIE adapter (using 2 molex perif cables coming from the PSU so the adapter is not on 1 cable but 2)  I figured this would be ok considering the S1 is undervolted and drawing less power

For 275 your voltage should be up around 900mv.
What is your voltage?

how do i check the voltage?  also on this particular S1 the yellow voltage deals are super tiny compared to my other S1, would that make a diff?

I figured it out, for some reason even though I dropped each resistor to 2.8-3k with my pencil they all were somehow even lower down to 2.5k after a few days, i wonder if the lead can heat up and do something weird which would lower the resistance even further?

[mstrongbow]

So what would happen if I just underclock to 275 without doing the pencil mod.

  you would hash at 140 gh and use 280 watts.


you need to understand how easy it really is to do.  2 -4 lite to medium pencil strokes on 8 resistors 4 on each side of the miner.

watts will drop from about 280 to about 170-200 depending on how perfect you got your resistors to drop.

Or watch my video guide

How to Undervolt (Pencil Mod) Your Antminer S1 video...
http://youtu.be/Cj9hgoUnpTc

It's still processing as I just uploaded it. Hope this helps!

[jowaybea]

I wanted to post my thanks for this.  I have 2xS1 that I may have gone a little heavy on the pencil, as they wouldn't mine stably @275mhz.  I even checked the voltage and they were all spot on .84v to .86v.  However, I clocked them on down to 250Mhz and they hash great @130GH.  And on a gold rated PSU the two combined are only pulling 303W @ the wall.  So, I'm considering 1.16 W/GH a success!

Thanks again!

[philipma1957]

I wanted to post my thanks for this.  I have 2xS1 that I may have gone a little heavy on the pencil, as they wouldn't mine stably @275mhz.  I even checked the voltage and they were all spot on .84v to .86v.  However, I clocked them on down to 250Mhz and they hash great @130GH.  And on a gold rated PSU the two combined are only pulling 303W @ the wall.  So, I'm considering 1.16 W/GH a success!

Thanks again!

heck that is better then my freq 275 hash 140gh and 187 watts

[jowaybea]

You know, I'm starting to suspect BTCGuild's Active worker summary.  If I look at the S1's self reported Miner status, it's reporting 127.5GH.  But nearly every time I look at BTCGuild it says >130.  I'd say it's about 132 +/-4.  However, if I look at BTCGuild's hourly chart, the numbers are definitely averaging less than 130GH.  Also, my S3's are kinda doing the same thing.  Reporting higher on BTCGuild than the local Miner Status.

So, 127.5GH @151W is more like 1.19 W/GH.  I'm kinda surprised they're doing even that well, as I still get HW errors...Running about 11-12K per 58K accepted shares.