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Posts Tagged ‘A2BOX overclock’

Innosilicon A2 Terminator Scrypt ASIC RPi OC Mod

15, Aug 2014

a2oc-modified-web-interface

Innosilicon still has not made any release of the source code of their cgminer fork with support for the A2 Scrypt ASIC chips, what you get with their A2 Terminator Scrypt ASIC devices is a Raspberry Pi with a preloaded cgminer and simple web interface to control the device. The standard web interface however is a bit limited in the supported operating frequencies – 1000 and 1200 MHz. The recompiled cgminer does allow for a few more operating frequencies to be used, however they are not selectable by default through the web interface of the miner. Some time ago there was a modified image released by a user called Emdje that supposedly allowed more overclock options. However it has turned out that it was not really functional as even though you could select operating frequency at steps of 5 MHz the cgminer did not accept these values and instead defaulted to some of the supported frequencies.

Back when we first had the chance to do a remote test of a A2BOX Scrypt ASIC miner we have discovered that the only supported operating frequencies by the Innosilicon A2 Terminator Scrypt ASIC miners are: 1000, 1080, 1100, 1200, 1280, 1300 and 1400 MHz. This is why we have made a modification to the standard RPi image that ships with the A2 miners, so that you can quickly and easily add the supported frequencies to be selectable from the web interface of the miner. This should allow you to squeeze some more extra performance from your device, regardless if it is the smaller 2 module or the large 6 module ASIC model, as our tests have shown that most of the miners should be able to work pretty well at up to 1280-1300 MHz up from the maximum of 1200 MHz that you have by default. Below you can download the modification we have prepared along with the instructions on how to update your miner, so that you get the extra OC options available.

How to login to your miner via SSH/SFTP using putty/WinSCP:

– username: pi
– password: innosilicon

Where to find the miner and web interface:

/var/www

Replace the index.php file with the following modification:
– modified index.php

All that is left is to refresh the webpage with the miner interface and you should see the new options for operating frequencies available in the dropdown boxes for the A2 modules. For the smaller miners you need to select just the first two frequencies as you can see on the image above, for the large A2 miners you need to set all of the six frequencies. Do note that each of the modules can operate at a different frequency, so experiment and set the best frequency for each one that gives the lowest HW error rate and optimum performance.


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