Thanks for the fast reply.
Would u consider 'ASUS Radeon RX 580 4GB Dual' and 'Sapphire 570 4gb nitro+' to mine at the same speed if both have samsung memory?
I have an Asus Radeon RX 580 8GB Dual with Hynix memory and a Sapphire Nitro+ RX 570 4GB with Elpida memory, after BIOS mod and overclock/undervolt I get the same speed on both with Claymore (30.1 Mh/s), both draw 105W from the wall, the only difference is that the Sapphire runs at 37C while the Asus at 55C...