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

[mstrongbow]

thanks philipma1957..

anyone take it to .75v?

I'm going to try to test the lower bounds in a couple days.

Here's all of the frequency settings I nave been able to find. The list isn't complete and is lacking some timeout numbers. I think I have the info for 200mhz and 193mhz. I just have to dig around.

Code:

#option 'freq_value'    '4f81'  #205GHs (16x)
        #option 'chip_freq'     '400'
        #option 'timeout'       '35'

        #option 'freq_value'    '5f05'  #202GHs (15.75x)
        #option 'chip_freq'     '393.75'
        #option 'timeout'       '36'

        #option 'freq_value'    '5e85'  #198GHs (15.5x)
        #option 'chip_freq'     '387.5'
        #option 'timeout'       '37'

        option 'freq_value'    '5e05'  #195GHs (15.25x)
        option 'chip_freq'     '381.25'
        option 'timeout'       '37'

        #option 'freq_value'    '4e81'  #192GHs (15x)
        #option 'chip_freq'     '375'
        #option 'timeout'       '38'

        #option 'freq_value'   '6c09'
        #option 'chip_freq'    '370.83'
        #option 'timeout'      '??'

        #option 'freq_value'    '5d05'  #188GHs (14.75x)
        #option 'chip_freq'     '368.75'
        #option 'timeout'       '38'

        #option 'freq_value'    '6b89'  #188GHs (14.75x)
        #option 'chip_freq'     '366.67'
        #option 'timeout'       '38'??

        #option 'freq_value'    '5c85'  #185GHs (14.5x)
        #option 'chip_freq'     '362.5'
        #option 'timeout'       '39'

        #option 'freq_value'    '5c05'  #182GHs (14.25x)
        #option 'chip_freq'     '356.25'
        #option 'timeout'       '39'

        #option 'freq_value'    '4d81'  #180GHs (14x) (default)
        #option 'chip_freq'     '350'
        #option 'timeout'       '40'

        #option 'freq_value'    '4c81'  #168GHs 
        #option 'chip_freq'     '325'
        #option 'timeout'       '45'??

        #option 'freq_value'	'0a81'	 #275
        #option 'chip_freq'	'275'
        #option 'timeout'	'51' or 45??
        
        #option 'freq_value'    '0a01' #267M
        #option 'chip_freq'     '267'
        #option 'timeout'	'53'

        #option 'freq_value'    '5102'   
        #option 'chip_freq'     '218.75'
        #option 'timeout'       '58'??

        #option 'freq_value'    '5082'   
        #option 'chip_freq'     '212.5'
        #option 'timeout'       '65'??

        #option 'freq_value'    '5002'   
        #option 'chip_freq'     '206.25'
        #option 'timeout'       '68'??

        #option 'freq_value'    '0781'   
        #option 'chip_freq'     '200'
        #option 'timeout'       '70'

        #option 'freq_value'    '4f02'   
        #option 'chip_freq'     '193'
        #option 'timeout'       '70'


        

Nice! Just underclocked my Ants, awesome guide.

I will fill in some of the frequencies above...I found a few googling around.

[allcoinminer]

Nice! Just underclocked my Ants, awesome guide.

I will fill in some of the frequencies above...I found a few googling around.

Take a look at BitMain's own undercloaking post.
It will give you an extra edge on down clocking and down volting.
It uses variable POTs to control voltage to the ASICs.
The Resistors adjacent to the DC-DC converter need to be removed and attach a pot there.
You need 1 pot for each DC-DC converter. The pot can be obtained from local market or ebay.
Pencil mod will also work but with a little effort I recommend Bitmaintech's own hardware hack method especially if you are a Do-It-Yourselves guy.
I will post the link to that post.
You can do it yourselves or can get help from any DIY guy or an electronic repair shop.

Update: Here is BITMAINTECH official undervolting/underclocking post https://bitcointalk.org/index.php?topic=526060.msg7031946#msg7031946

[Brassguy]

Like this

If you have the skills it's the best way to go.
Congrat's. Got pic's?

Sure do! sorry for the bad pic, I put it into service immediately

Hot melt glue, 10K pots, works great!

[thresher]

Any videos of this anywhere.  Way to confusing for me without a video
All the pencil mod ones on youtube don't use voltmeters either?

[mstrongbow]

Any videos of this anywhere.  Way to confusing for me without a video
All the pencil mod ones on youtube don't use voltmeters either?

It's super easy to do! Don't even have to check the voltage to get decent results. Just check the Ohms before and after applying the pencil. I will see about putting a short video up for the S1 pencil mod.

[philipma1957]

Any videos of this anywhere.  Way to confusing for me without a video
All the pencil mod ones on youtube don't use voltmeters either?

It's super easy to do! Don't even have to check the voltage to get decent results. Just check the Ohms before and after applying the pencil. I will see about putting a short video up for the S1 pencil mod.

8 resisters 2 or 3 pencil strokes on each one.

ohms before 4.47k  ohms after   2.9- 3.4k 

   I allowed that much variance on purpose.

Why because I wanted to see how forgiving the s-1 would be  to less then perfect ohms.   I did 3 s-1's     two run at freq 275 one runs at freq 300  .. they pull   560 watts and do 420gh   more then a month now .. no adjustments of any kind.   watts stay between 555 and 565 hash stays near 420.  I can begin to say how easy this is to do.

don't muscle the pencil strokes  .  I used less pressure on them then when I write with a pencil.   if you resisters stay between 2.9 and 3.4  you should do  around 140gh a machine around 185 watts

[mstrongbow]

Any videos of this anywhere.  Way to confusing for me without a video
All the pencil mod ones on youtube don't use voltmeters either?

It's super easy to do! Don't even have to check the voltage to get decent results. Just check the Ohms before and after applying the pencil. I will see about putting a short video up for the S1 pencil mod.

8 resisters 2 or 3 pencil strokes on each one.

ohms before 4.47k  ohms after   2.9- 3.4k 

   I allowed that much variance on purpose.

Why because I wanted to see how forgiving the s-1 would be  to less then perfect ohms.   I did 3 s-1's     two run at freq 275 one runs at freq 300  .. they pull   560 watts and do 420gh   more then a month now .. no adjustments of any kind.   watts stay between 555 and 565 hash stays near 420.  I can begin to say how easy this is to do.

don't muscle the pencil strokes  .  I used less pressure on them then when I write with a pencil.   if you resisters stay between 2.9 and 3.4  you should do  around 140gh a machine around 185 watts

I had 5x S1's running off a single 1000 Watt PSU  The hardest part was finding the frequency each miner preferred (lowest HWE etc)

[thresher]

Thanks for the replies.  I guess I will try it again another day or something.  Just sort of intimidating for me (like the first time you change a spark plug or something, your afraid your going to break everything.)

[philipma1957]

Thanks for the replies.  I guess I will try it again another day or something.  Just sort of intimidating for me (like the first time you change a spark plug or something, your afraid your going to break everything.)

the key to it is do not muscle the pencil  .  2 or 3 medium pressure strokes  on each of the 8 resistors. the ohm's should drop from 4.47k to 3.2k or so


  then set freq at 325 300 or 275 or 250.

check the freq got set  at one of the above.  then check your hashing make sure the hw are pretty low    1 out of 80 or better is good.  make sure no x just o   on the two asic lines.  if there are a lot of x  try a freq lower..

 I started with 325 on all three and it sucked.

Then 300 and only 1 was good no x's 1 out of 75-80 errors.

Then 275 on the other 2 they were good no x's and 1 out of 110 errors.

[grn]

Thanks for the replies.  I guess I will try it again another day or something.  Just sort of intimidating for me (like the first time you change a spark plug or something, your afraid your going to break everything.)

the key to it is do not muscle the pencil  .  2 or 3 medium pressure strokes  on each of the 8 resistors. the ohm's should drop from 4.47k to 3.2k or so


  then set freq at 325 300 or 275 or 250.

check the freq got set  at one of the above.  then check your hashing make sure the hw are pretty low    1 out of 80 or better is good.  make sure no x just o n the two asic lines.  if there are a lot of x  try a freq lower..

 I started with 325 on all three and it sucked.

Then 300 and only 1 was good no x's 1 out of 75-80 errors.

Then 275 on the other 2 they were good no x's and 1 out of 110 errors.

300 is fine with 3.3 - 3.4 k

[marunga]

Hello miners,

My undervolt using 10K potentiometers in parallel with the smd resistors...

http://38.media.tumblr.com/d173c8c830b4e113d7216398767f490f/tumblr_n7y0nynSm31te5ijpo1_1280.jpg

Used double-side tape under the potentiometers and soldered directly to the PCB.
Easy way to adjust voltage.

rgds,
m

Edited:spelling

[philipma1957]

Hello miners,

My undervolt using 10K potentiometers in parallel with the smd resistors...



Used double-side tape under the potentiometers and soldered directely to the PCB.
Easy way to adjust voltage.

rgds,
m

if you have the skill set to do the work it is the best way.

I wonder if the new s-3's will be reducible to  .5 or .6 watts from the .78 watts .

  obvious that we are talking about doing thus mod in 3 or 4 months. not right now

[armin22]

Is there a way someone can make a quick tutorial for this please? I'm too dumb/blind to see what to do.

[mstrongbow]

Is there a way someone can make a quick tutorial for this please? I'm too dumb/blind to see what to do.

I should have mine posted on youtube later tonight. I will post a link here after it has uploaded.

[armin22]

Is there a way someone can make a quick tutorial for this please? I'm too dumb/blind to see what to do.

I should have mine posted on youtube later tonight. I will post a link here after it has uploaded.

THANK JESUS!

Would this mulimeter work? : http://www.halfords.com/motoring/garage-equipment/hand-tools/rolson-digital-multimeter?cm_mmc=Google+PLA-_-Garage+Equipment-_-Hand+Tools-_-710273&istCompanyId=b8708c57-7a02-4cf6-b2c0-dc36b54a327e&istItemId=wxmtpaxpq&istBid=tzwl&_$$ja=cgid:8475777004|tsid:35522|cid:166296844|lid:50612710975|nw:g|crid:44739949204|rnd:17480797208219915733|dvc:c|adp:1o2|bku:1&gclid=CKiFiNvipL8CFUn4wgodRR4A2g

[philipma1957]

Is there a way someone can make a quick tutorial for this please? I'm too dumb/blind to see what to do.

I should have mine posted on youtube later tonight. I will post a link here after it has uploaded.

THANK JESUS!

Would this mulimeter work? : http://www.halfords.com/motoring/garage-equipment/hand-tools/rolson-digital-multimeter?cm_mmc=Google+PLA-_-Garage+Equipment-_-Hand+Tools-_-710273&istCompanyId=b8708c57-7a02-4cf6-b2c0-dc36b54a327e&istItemId=wxmtpaxpq&istBid=tzwl&_$$ja=cgid:8475777004|tsid:35522|cid:166296844|lid:50612710975|nw:g|crid:44739949204|rnd:17480797208219915733|dvc:c|adp:1o2|bku:1&gclid=CKiFiNvipL8CFUn4wgodRR4A2g

most likely it would.  it has ohms at 20000.  the  8 stock resistors should read 4470  so if you set the ohm part of the meter  to 20000 you should get 8 readings close to the same.

if you do the 2-3 pencil strokes   it should drop to 3000   as long as the 8 resistors are all close it is the only reading you need.

 mine range from 2.9 to 3.4 k  or 2900 to 3400.

 i allowed for that much variation on purpose so that I could post on this site that perfect ohm readings of 3200 or 3.2 across the board are not needed to work.

[armin22]

Is there a way someone can make a quick tutorial for this please? I'm too dumb/blind to see what to do.

I should have mine posted on youtube later tonight. I will post a link here after it has uploaded.

THANK JESUS!

Would this mulimeter work? : http://www.halfords.com/motoring/garage-equipment/hand-tools/rolson-digital-multimeter?cm_mmc=Google+PLA-_-Garage+Equipment-_-Hand+Tools-_-710273&istCompanyId=b8708c57-7a02-4cf6-b2c0-dc36b54a327e&istItemId=wxmtpaxpq&istBid=tzwl&_$$ja=cgid:8475777004|tsid:35522|cid:166296844|lid:50612710975|nw:g|crid:44739949204|rnd:17480797208219915733|dvc:c|adp:1o2|bku:1&gclid=CKiFiNvipL8CFUn4wgodRR4A2g

most likely it would.  it has ohms at 20000.  the  8 stock resistors should read 4470  so if you set the ohm part of the meter  to 20000 you should get 8 readings close to the same.

if you do the 2-3 pencil strokes   it should drop to 3000   as long as the 8 resistors are all close it is the only reading you need.

 mine range from 2.9 to 3.4 k  or 2900 to 3400.

 i allowed for that much variation on purpose so that I could post on this site that perfect ohm readings of 3200 or 3.2 across the board are not needed to work.

I'm confused, which "pins" am i supposed to add the strokes to? This is why i am desperately in need of a video tutorial.

[armin22]

Also do i have to do this to both boards? or will doing it for one board apply it to the whole thing?

[Brassguy]

4 resistors per board. Both boards would have to be done.

[armin22]

I guess i should just wait for the youtube tutorial.