Posts Tagged ‘gc3355 cgminer’

Alternative cgminer 3.7.2 for Scrypt Mining on Gridseed 5-chip GC3355 ASICs

22, Mar 2014

cgminer-3-7-2-gridseed-windows-alt

There is a new fork of cgminer for the Gridseed 5-chip GC3355 ASIC devices that we have compiled for windows (source) that you can download below, it is based on the previous version by dbartle, but adds some useful extra functions for people with multiple ASICs. You get to set the operating frequencies of the ASIC at a smaller steps from 700 to 1088 MHz, below is the full list of supported frequencies:

700, 706, 713, 719, 725, 731, 738, 744, 750, 756, 763, 769, 775, 781, 788, 794, 800, 813, 825, 838, 850, 863, 875, 888, 900, 913, 925, 938, 950, 963, 975, 988, 1000, 1013, 1025, 1038, 1050, 1063, 1075, 1088.

Also you are able to set different operating frequency for each device by giving the devices’ serial number and operating frequency, below is an example:

--gridseed-freq 6D9426984857=988,6D9656774857=975,6D8956965251=975

This can help you maximize the hashrate that you get from all of the devices you have, though it will need some time to figure out what is the best frequency for each of your ASICs. You can normally see the serial number of a device after the GSD X, this also works with both the newer and older revisions, the only difference is the serial number you will see (0001 for the older vs something like 6D8956965251 for the newer devices). Note that you should be able to set a general frequency and only change some of the miners operating frequency with their serials.

– You can download cgminer 3.7.2 ALT for Gridseed ASICs on Windows OS here…

Updated cgminer 3.7.2 OC for Mining on Gridseed 5-chip GC3355 ASICs

21, Mar 2014

cgminer-3-7-2-gridseed-25mhz-frequency

We have compiled a windows binary of the latest cgminer 3.7.2 for Gridseed 5-chip GC3355 ASICs (source) that allows you to have finer control over the overclock frequencies you select. Previously you had to increase frequencies in steps of 50 MHz, with this version however you are able to use smaller steps of 25 MHz. So instead of having to go from 850 MHz to 900 MHz, now you can also try running at 875 MHz. This may allows you to squeeze a few more KHS out of your ASIC device when overclocking it to the maximum stable frequency with low or no HW errors at all.

– You can download cgminer 3.7.2 OC for Gridseed 5-chip GC3355 ASICs on Windows OS here…

Voltmod Update for the Gridseed 5-chip BTC/LTC ASIC Miners

19, Mar 2014

gridseed-asic-higher-voltage-mod-new

Yesterday we have reported about a solution for volt modding and overclocking even higher the 5-chip Gridseed ASIC miners for use with the cgminer software modified to support Gridseed ASICs. We have tested the voltage modification on our older and newer revision ASIC miners, and t has allowed us to go from 850 to 950 MHz overclock on the newer miner. Unfortunately it was not working on the older ASIC miner and it was not working with other software miners such as bfgminer or cpuminer for Gridseed. Meanwhile there is an update that solves both of these issues we’ve experienced with the earlier solution. In fact you only need to solder a bridge between another two points on the ASIC miner – note the second green strip on the right from the firs one from yesterday where you need to solder too. This modification will permanently activate the higher voltage and should allow you to overclock all (most likely) Gridseed 5-chip ASICS regardless of their revision and firmware version with all of the available software miners that support them.

gridseed-asic-permanent-voltage-modification-cgminer

The power consumption after applying the permanent voltmod is 10W per 5-chip Gridseec ASIC miner with the fan or about 8W if you remove the fan and use passive cooling (not recommended for voltmoded miners) or use another form of active cooling. Doing the permanently activated voltmod solution we are still able to get best results at 950 MHz with no to very few HW errors and performance of a little over 400 KHS. Pushing for 1000 and 1050 MHz is also possible (going for 1100 MHz or more results in only getting HW errors), but the number of HW errors increases as well, so the actual performance might be lower than running the miner at lower frequency such as 950 MHz with less HW errors. As always do try on your own hardware as there is a variance and you might be able to get better results with your miners. If you do plan to do the hardware voltage modification be aware that there is a risk of damaging the ASIC, especially if you are not good with the soldering iron, so proceed with caution.


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