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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.