Posts Tagged ‘Bitmain overclock

It seems that just like with the newer Antminer Z9 Mini the new faster Antminer Z9 Equihash ASIC miners from Bitmain are arriving with locked overclock functionality in the firmware. We already know that these ASIC miners are overclocking pretty well and you can easily get a nice performance boost over the stock hashrate the devices come with, so why is Bitmain limiting you… it is pretty clear, they want you to buy more units. Fortunately there are alternatives that allow you to overclock your Antminer Z9 miners and get a nice extra performance boost. Initially there was only a modified firmware released by user efudd on Bitcointalk that was sold to interested people, but now there is also a free version of a modified firmware available with unlocked frequencies by smartass111. Of course you are more than welcome to make a donation to the author of the modified firmware in order to support and motivate him.

The new faster in terms of hashrate Bitmain Antminer Z9 ASIC miners do seem to be more limited in terms of operating voltage, so you will most likely will not be able to overclock them as much as a Z9 Mini, but still going from the default operating frequency of 500 MHz to 625 or 650 MHz should be possible on pretty much all miners. If you are lucky you might be able to even squeeze some more extra as well, just make sure you keep the chips cool enough when you start to overclock and also to have a powerful enough power supply that can handle the extra load that it will get after the overclock. Getting an extra performance boost of 20% or maybe even a bit more for free is something that you should definitely take advantage of if you have some Antminer Z9’s.

For more information and to download the free modified Antminer Z9 OC unlocked firmware…

bitmain-antminer-s1-200-ghs-overclock

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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