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

[Brassguy]

I'm curious Beaflag... which of your ants have the 1200uf capacitors and which have the 1500uf caps?

[1714920901]

1714920901

[1714920901]

1714920901

[elaramus]

Finished my other 3 antminers. I'm guessing the results on the first one were a bit of an oddity, but I'll try and work on that one a little later. More results:
Ant4

Code:

Ant4
R3  Resistance 3.92 1.011v top / 1.004v bottom
R66 Resistance 3.85 1.007v top / 1.000v bottom
R38 Resistance 3.89 1.006v top / 0.999v bottom
R52 Resistance 3.85 0.982v top / 0.976v bottom

R3  Resistance 3.91 1.000v top / 0.992v bottom
R66 Resistance 3.84 0.991v top / 0.984v bottom
R38 Resistance 3.98 1.020v top / 1.012v bottom
R52 Resistance 3.85 0.990v top / 0.984v bottom

Frequency = 350
Power Consumption = 293 watts
Roughly =  171.05 GH
15 Minute Error Rate = 3.4754098360655737704918032786885

-

Frequency = 325
Power Consumption = 273 watts
Roughly = 168.46 GH
45 Minute Error Rate = 0.21840130246594925147917245761029

I'd still like to see a 200-300 Frequency table with some different numbers in there. My first antminer runs with a super low HW error rate at 250, but horrible at 275, and I think I could bump it up a little bit.

Beaflag VonRathburg, excellent results and information. Instead of using the pencil-mod, I've chosen to add a 1/8w film resistor in parallel with the ones listed above. For instance adding a 10K ohm resistor creates a total resistance of 3.08k which drives the chips at .89v. But I too am seeing sporadic results with the hardware errors. I've ordered a number of other value film resistors from Mouser to play with this week (12K,14K,15K,16K,17K,18K,20K and 22K). I think the results you've posted for Antminer #4 are promising and that the chips enjoy being fed at least 1v.

The point of all this blather is I was wondering if you could run ANT 4 specifically at 275 and 250MHZ and post the results?

Code:

#option 'freq_value'	'0a81'	#275
        #option 'chip_freq'	'275'
        #option 'timeout'	'51'
        
        #option 'freq_value'    '0a01' #267M
        #option 'chip_freq'     '267'
        #option 'timeout'	'53'
        
        #option 'freq_value'    '0981'  #250M
        #option 'chip_freq'      '250'        
        #option 'timeout'         '56'         
                                             
        #option 'freq_value'    '0901' #237M
        #option 'freq_value'    '237'
        #option 'timeout'	 '59'
        
        
        #option 'freq_value'    '0881'  #225M
        #option 'chip_freq'     '225'
        #option 'timeout'       '63'

[xray]

I have just ordered a multimeter, anyone got a link or video in detail to undervolt these ant s1, going to give it a go tomorrow

[tzortz]

Get ready for the surgery. 

[Beaflag VonRathburg]

I'm curious Beaflag... which of your ants have the 1200uf capacitors and which have the 1500uf caps?

All of them are 12/16/2013 1500uf units.

Finished my other 3 antminers. I'm guessing the results on the first one were a bit of an oddity, but I'll try and work on that one a little later. More results:
Ant4

I'd still like to see a 200-300 Frequency table with some different numbers in there. My first antminer runs with a super low HW error rate at 250, but horrible at 275, and I think I could bump it up a little bit.

Beaflag VonRathburg, excellent results and information. Instead of using the pencil-mod, I've chosen to add a 1/8w film resistor in parallel with the ones listed above. For instance adding a 10K ohm resistor creates a total resistance of 3.08k which drives the chips at .89v. But I too am seeing sporadic results with the hardware errors. I've ordered a number of other value film resistors from Mouser to play with this week (12K,14K,15K,16K,17K,18K,20K and 22K). I think the results you've posted for Antminer #4 are promising and that the chips enjoy being fed at least 1v.

The point of all this blather is I was wondering if you could run ANT 4 specifically at 275 and 250MHZ and post the results?

Honestly, make things easy on yourself and just use the pencil. It doesn't cost anything and you can adjust the results with a swipe. Keep things simple.

[elaramus]

Honestly, make things easy on yourself and just use the pencil. It doesn't cost anything and you can adjust the results with a swipe. Keep things simple.

Too late for that... resistors are already on the way. I have 30+ ants to do, and I'm faster with the iron than I am with the graphite...

I was really curious about the power draw using 1v @ 250 and 275Mhz... for the others following this thread, I will post pics and results when I get my parts in later this week.

[klondike_bar]

does the antminer S1 use cron/crontab?

It would be interesting to be able to set cron events to match time-of-use billing for electricity use.

for example, if you pay more from 11am until 5pm:

have crontab event start at 11am (convert the antminer to the right timezone or more simply do the math yourself and avoid changing fromt he shanghai timezone on every unit)
change frequency to a lower value
restart cgminer (just cgminer if possible rather than the entire antminer)
at 5pm, have cron change the frequency back to the higher value once power is cheaper (and when you are less likely to be making your location even hotter than it is in summertime)

[klondike_bar]

little bit of digging and my above post should be possible, but i need input from someone a bit more practiced in UNIX/cron

step 1: SSH and login (root/root)
step 2: type "crontab -e"
step 3: create this pair of new entries:

# reduce frequency at noon (00:00 default shanghai time)
0 0 * * 1-5 /vi /etc/config/asic-freq  *specify line of code to edit*  *reboot*
# increase frequency at 5pm (05:00 default shanghai time)
0 5 * * 1-5 /vi /etc/config/asic-freq  *specify line of code to edit*  *reboot*

cron reads itself every minute so this should work fine. My biggest issue is I have no idea how to gracefully merge the commands of editing specific lines in the asic-freq file and rebooting the miner afterwards

[lucazane]

2 files :
asic-freq-high with high clock.
asic-freq-low with low clock

# reduce frequency at noon (00:00 default shanghai time)
0 0 * * 1-5 cd /etc/config && cp asic-freq-low asic-freq  && reboot
# increase frequency at 5pm (05:00 default shanghai time)
0 5 * * 1-5 cd /etc/config && cp asic-freq-high asic-freq  && reboot

[klondike_bar]

2 files :
asic-freq-high with high clock.
asic-freq-low with low clock

# reduce frequency at noon (00:00 default shanghai time)
0 0 * * 1-5 cd /etc/config && cp asic-freq-low asic-freq  && reboot
# increase frequency at 5pm (05:00 default shanghai time)
0 5 * * 1-5 cd /etc/config && cp asic-freq-high asic-freq  && reboot

thank you    I just set this up on one of my miners to run noon->5pm at lower speed to see how it works out.

if all goes well this would pair nicely with a voltage mod to use the least power when TOU is $0.12/kwh and maximum speeds when it is only $0.07/kwh

Is there any easy way to modify files for this (the two asic-freq files and crontab) on all my miners simultaneously?

[jwcastle]

Excellent article! I under-volted my S1 following your directions. Although I do have a volt meter, I found it very difficult to get proper measurements because the resistors are so tiny. In the end I just rubbed some pencil graphite from any pencil (not HB). So I have no idea what the resistance is or the voltage at the two locations.
Then I looked at the status screen and everything looked ok. Look at the average GH/s & HW on the screen shot. And it's pulling 201-watts at the wall.

[vodic62]

Is there any easy way to modify files for this (the two asic-freq files and crontab) on all my miners simultaneously?

Simultaneously not, but there is faster way then edit everything again and again. You can copy files directly from one antminer to another. For example:

Code:

scp /etc/config/asic-freq-high 192.168.something.something:/etc/config

[Trends]

Rough numbers!
By dropping your 200Gh down to 115Gh for the 6hrs (11am-5pm) saves $0.32 day or $9.60 mth in electric costs BUT you lose 0.001225BTC per day worth ~$0.55 or $16.50 mth with BTC at $450.00

Is it worth it?

[klondike_bar]

Rough numbers!
By dropping your 200Gh down to 115Gh for the 6hrs (11am-5pm) saves $0.32 day or $9.60 mth in electric costs BUT you lose 0.001225BTC per day worth ~$0.55 or $16.50 mth with BTC at $450.00

Is it worth it?

IMO, not *yet*. I plan to undervolt starting late next month unless the BTC/USD ratio keeps climbing.

[klondike_bar]

Is there any easy way to modify files for this (the two asic-freq files and crontab) on all my miners simultaneously?

Simultaneously not, but there is faster way then edit everything again and again. You can copy files directly from one antminer to another. For example:

Code:

scp /etc/config/asic-freq-high 192.168.something.something:/etc/config

I imagine I would do this from the SSH (putty) instance on the machine that i have modified already? ie:

Code:

scp /etc/config/asic-freq-high 192.168.1.201:/etc/config
scp /etc/config/asic-freq-low 192.168.1.201:/etc/config
scp crontab 192.168.1.201:/

I imagine that it the crontab copy method will not work like this though? 

is it possible to do something like this to have it operate to all IP addresses with antminer units (and is a user/pass not needed for each?)?:

Code:

scp /etc/config/asic-freq-high 192.168.1.201-192.168.1.220:/etc/config
scp /etc/config/asic-freq-low 192.168.1.201-192.168.1.220:/etc/config
scp crontab 192.168.1.201-192.168.1.220:/

[vodic62]

I imagine I would do this from the SSH (putty) instance on the machine that i have modified already? ie:

Code:

scp /etc/config/asic-freq-high 192.168.1.201:/etc/config
scp /etc/config/asic-freq-low 192.168.1.201:/etc/config
scp crontab 192.168.1.201:/

I imagine that it the crontab copy method will not work like this though? 

is it possible to do something like this to have it operate to all IP addresses with antminer units (and is a user/pass not needed for each?)?:

Code:

scp /etc/config/asic-freq-high 192.168.1.201-192.168.1.220:/etc/config
scp /etc/config/asic-freq-low 192.168.1.201-192.168.1.220:/etc/config
scp crontab 192.168.1.201-192.168.1.220:/

You can optimize little bit, but it's not possible to make it for every antminer at once. Not without certificates and scripting.

Code:

scp /etc/config/asic-freq-* 192.168.1.201:/etc/config
scp /etc/crontabs/root 192.168.1.201:/etc/crontabs

[rograz]

The Swedish summer has betrayed me (27C atm, last summer it never went above 23C!) might end up undervolting sooner than I had anticipated. What's the lowest possible voltage you can get btw?

[Gologuzan]

can anyone help me?

i need values for those but to make s1 to spend around 300-330w

option 'freq_value'    ' '
option 'chip_freq'     ' '
option 'timeout'       ' '

is it possible?

thx.

[philipma1957]

I just did my very first under volt under clock.

I have a good multi meter all resistors read 4.46 or 4.47 to start.

adding graphite is not exact and I had variance from 2.81 to 3.42    2 machines so 16 resistors.

one machine does not like running at freq  300 it had 20 percent   error rate.  so I dropped it to freq 275

 these two machines with just under clock to 300 each pulled 616 watts. and hashed at 305gh

once I did both under volt and under clock

I am now hashing at 295gh with 399 watts

at over clock of 393 I had  398gh at 818 watts.

[wpgdeez]

Nice results!

I just did my very first under volt under clock.

I have a good multi meter all resistors read 4.46 or 4.47 to start.

adding graphite is not exact and I had variance from 2.81 to 3.42    2 machines so 16 resistors.

one machine does not like running at freq  300 it had 20 percent   error rate.  so I dropped it to freq 275

 these two machines with just under clock to 300 each pulled 616 watts. and hashed at 305gh

once I did both under volt and under clock

I am now hashing at 295gh with 410 watts

at over clock of 393 I had  398gh at 818 watts.