I have Windows 10 and it keeps blowing up.. It will run great at default 27-28 MH/s for each RX 480.. I reboot than bam I am down to a lousy 19-20 MH/s! I have to system restore.. than damn system restore blows up and I can't restore back anymore.. Anyone else having issues with Windows 10? I am about to try the damn Windows 7 more than 6 GPU hack as I have 7 GPU cards!
Make sure that no monitoring software (like HWiNFO64) is launching at the start up. It may impact hashing speed seriously, especially main GPU. In my case it was 28MH/s reduced to 6MH/s on the main GPU.