I get about 23MH on Linux and 25.7MH on Windows 10 with my Powercolor Rx480 8GB. I tried this Bios and the hash rate became only 1.5MH and the system was unstable so I have gone back to the stock bios. In the modified bios, the clock speed is slower and the memory speed slightly higher than the original bios settings.
copy the pre last straps to last straps then add the same core and memory values to your bios power color is somewhat power hungry and tight timing
"I can get 2 GPUs going with the H97 Anniversary mobo, and EVGA PSU, but when I connect any more and try to boot, straight away I get a startup message saying I need to connect an extra Molex cable from the PSU into the mobo for extra power.
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power color is somewhat power hungry and tight timing