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How to Overclock Your Bitmain AntMiner S1 to 200 GH/s

27 Jan


The Bitmain AntMiner S1 Bitcoin ASIC miners are shipped at 180 GH/s default hashrate and they do support easy overclocking to about 200GH/s or a little over by increasing the operating frequency of the chips that is set at 350 MHz by default. Increasing the frequency to 400 MHs seems to be the most common solution to overclock your AntMiner S1 in order to get about 200GH/s hashrate, however that leads to an increase in the number of HW errors that you are getting. Now, it is completely normal to get some HW errors for an ASIC, especially overclocked one, but the percentage value should be fairly low if everything is normal.

When you login to the Bitmain AntMiner S1 web interface and open the Miner Status page you have a field called HW, this field may show a high value, but in order to calculate the actual percent of the HW errors you need to use a special formula and not directly compare the number in the Accepted and HW fields as they may show similar numbers getting you to think that you are getting way too many errors when that is not the case.

AntMiner S1 HW Error Calculation Formula:

HW / (diffA + diffR + HW) * 100

By using the formula above we can calculate that our miner has:

1937 / 1747537 * 100 = 0.11% HW Error Rate

0.11% is a very acceptable HW Error percentage for a Bitmain AntMiner S1 ASIC overclocked to provide about 200 GH/s hashrate. That is however the case with our settings using 393 MHz overclock frequency of the chips with an average of 201.55 GH/s hashrate. If overclocking to 400 MHz we are getting a little bit of a GH/s increase, however the HW Error rate also goes from 0.11% to a little more than 1%, so no point pushing the clock of the chips to 400 MHz in our opinion.

In order to overclock your Bitmain AntMiner S1 ASIC to provide 200 GH/s and low HW Errors rate with our settings you need to follow the steps below:
– Login with SSH to your AntMiner S1 ASIC using the IP and username/password you’ve set it to use.
– Type “cd /etc/config” (without the quotes) in order to get to the folder where the config file is located on the miner.
– Type “vi asic-freq” (without the quotes) to edit the config file, comment the currently set options by placing # in front of them and add the following lines or directly replace the values with the following ones:

option ‘freq_value’ ‘5f05’
option ‘chip_freq’ ‘393.75’
option ‘timeout’ ’36’

– Save the changes you have made and type “reboot” (without the quotes) to restart the miner, so that it can apply the new settings and start mining at 200 GH/s with the overclock settings you’ve set.

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10 Responses to How to Overclock Your Bitmain AntMiner S1 to 200 GH/s

Kendall Bassett

February 23rd, 2014 at 19:05

Here is a link on how to use vi, the least intuitive text editor there is.


March 13th, 2014 at 12:56

got mine running on ~205 @ 45&47 degrees celsius! 13.8% increase – 1.71% hw error leaves bout ~12% more profit than on default.
I do have to mention, my antminer is upside down, has extra fan that sucks the air out and i have it boxed from 3 sides with plexi.


March 21st, 2014 at 00:09

Thanks a lot for info how to use vi Kendall Bassett :-)
I didn’t know how to bite it…


March 21st, 2014 at 00:55

I did what you told me to do. I just got the S1 today and another one on its way. The S1 is staying at 188-190. How do i fix this?


March 21st, 2014 at 01:15

You can always try to increase the frequency to 400 MHz and see if the miner will run stable and with low number of HW errors, however most likely the number of errors will increase and though the local hashrate may be higher the actual one at the pool might be lower than running the device on the lower operating frequency.


May 1st, 2014 at 18:40

Thanks for this website. So far my unit is 43c and is running at 200+. The hardware rate is about 0.23%. Awesome. Of course I keep it in a 62 degree Fahrenheit room.


May 2nd, 2014 at 16:25

Will this S1 it ROI. I brought one today for 0.55 btc


May 21st, 2014 at 09:08

My S1 has been running at default 350MHz with no H/W errors at all. I tried to overclock to 393.75 as per this post, but as soon as I did hardware errors started counting up at about 1 every 2-3 seconds (didn’t bother to calculate the rate, as 0% –> n% is an infinite %age increase ;-/ ). Seriously, though, I tried at the stock 375MHz and again the thing runs at 0% errors.

I’d like to try and edge it up further and keep 0%, but I can’t find how to calculate the ‘chip_value’ and ‘timeout’ for a given ‘chip_freq’ – anybody got any info on that ? How did you arrive at the values you gave above ?


May 28th, 2014 at 15:59

William hile

August 3rd, 2014 at 21:07

Received my S1 used… it was set factory to 350 I was running about 0.33 HWER I made the changes and have been running about 4 hours and re calculated it and im still seeing about 0.35 HWER.. .so far I went from 180 GH/s to just over 200GH/s going to let it run and see how it does. Thanks for the information.


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