great miner .....
I create custom bios example with 1.2.6

sapphire RX 580 Nitro + 8GB
ETH 30-32 MH / s, XMR 990-1100H / s Micron


Bios Sapphire Pulse ITX RX 570 4GB Elpida / Hynix ETH 29-31MH / s Elpida, ETH 28-29MH / s Hynix
XMR 1000 H / s Elpida, XMR 990 H / s Hynix

all cards 560/570/580 with stable custom settings and low power
if you are looking for send me pm