Topic: [GUIDE] Undervolt antminer s1 [1.19W/GH at the wall] - page 8. (Read 69555 times)

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.

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!

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.

Thanks for the video! Going to give this a try ...

8 )

Check out my YouTube video...link in my sig!

Hello,

I was wondering if anyone could help me undervolt the S1.
I currently have a v1.6 2014/01/04 and a v1.5 2013/12/16. both have the same readings for the R3 and R12 resistors.

my resistor for R3 is 1.69k OHMS, and R12 is 4.4kohms.
R12 being the one on the left and R3 being the one on the right.
should i just be modding pencil modding the R12 or am I modding the R3?
if R3 how much is should i lower it to?

Yeah thats right. I have 2 S1´s right now mining at 400 GH/s together at 420W each i think because OC.... and waiting for 2 S3(im batch 2).

But once i get my 2 S3, i will sell my S1, but yeah right now if you just have S1, its nice to undervolt them, and its so easy and you safe a lot of power

The advantage is, he's hashing with those Today. Undervolted S1's may not be as cost effective per watt as the S3, but the advantage is time. There are loads of used S1's floating around that you can buy right now, and even the earliest ship date for the S3 is 7/14 + however long it takes to get to you. Batch 3 is sold out, and no telling when batch 4 will ship. So if you missed the S3 boat, an undervolted S1 lets you stay relatively competitive before the S3's hits.

Why you dont prefer to buy 1 S3 for example? 366W @478 GH/s.

This tutorial is great but when you use 3 undervolted, would be better just 1  S3.

Just wanted to say "thanks" for all the info. Picked up used s1's and they are now voltmodded  

Yeah but i mean, i can run 2 S1 @332W for 280GH/s .... or buy another S3 when i can, and it will be 366W for 478GH/s. I mean its almost the same W(332W vs 366W) but the GH/s is much higher on S3 than S1 (478GH/s vs 280GH/s)

I am running 6 S1's as together they are still making @$20 a day and cost me @$7 to run with BTC at $620.  So I plan on keep running them at normal speed until the cost gets closer to what they make then undervolt them which will drop my cost in about half. Also if BTC would happen to go back up they will stay profitable for sometime to come or I may want to run them during the winter just for the heat. I  have 1 S3 coming but nobody knows for sure at this point what kind of unforeseen problems the S3 may have and I will not buy more until they get out into people's hands first.

Hi there. I have 2 S1 and i was thinking to sell them, because i bought 2 S3.

Then i found this tutorial for undervolting antminer S1.

But i dont know whats the "pencil mod". what do i have to do?? just press where the image says with a pencil? or what? i dont get it xD

Oh and most important thing.

Is it worth it to dont sell S1, and when i have my S3(478GH/s @366W without OC),with my Corsair CX750M, then undervolt my 2 S1 and use them also with my 2 corsairs? Together with the S3?. Or i should better sell them?.

Considering:

332W --> 280 GH/s (2 S1 with pencil mod) vs 366W --> 478 GH/s (1 S3).

Is it worth it to undervolt then? or better sell them and buy maybe another S3.


edit: ok i found here the pencil mod video tutorial, i will watch it to see how it works

 A note on this .. I used q-tips and 91% alcohol to set my 3 back to stock.  I sold them and I am shipping them out today.

 If you look very closely I had a 1,000,000,000 share.  as I am solo mining while I test     a block share is 16,000,000,000   so I was pretty close. would have been really nice to grab a block right before i ship.

The S1's I have, have a Female RP-SMA connector so I used an antenna with a Male RP-SMA connector, I only setup one S1 with wifi with all S1's going into a switch and out through that one wifi connection. The antenna is a D-Link ANT24-0700.

8 )

Thanks!!!!

Yeppers. That easy!

Once I undervolt, how easy is it to return an S1 to stock 180 gh/s  (to perhaps sell at a future date) ?

Is it as easy as erasing the graphite and resetting the asic frequency?