Can someone point me in the direction to mod the bios on the following for low power consumption or at least better than stock bios mining:

I have rigs with the following :

Powercolor red devil 1330mhx RX 480 8GB
Sapphire nitro rx 470 4gb
sapphire nitro rx 480 4 gb
sapphire nitro rx 480 8 gb

All will use powered risers 1x - 16x if that matters.


These are all about to get installed into rigs for minining and I want to set it right up at the start.