Sapphire RX 570 NITRO 4GB Hynix
XFX RX 570 4GB Elpida
Stock settings and BIOS I get 23.x Mh/s on ETH only and 21.x/640ish ETH/SC. I've tried Anorak's BIOSes as well as setting the straps through Polaris and OCing using Wattman and at least 3 different AMD drivers. Nothing works, I see no change at all. I am running out of ideas. Tomorrow I will move one of the cards to another computer just to see what happens. If I'm doing something wrong I have no idea what it could be.
Sapphire RX 570 NITRO 4GB Hynix.
BIOS adjust memory timing, memory locking 1950 or 2050-2100, core lock 1100, can reach 27-29 Mh/s
If you are Sapphire RX 570 Pulse 4GB Hynix , I can send you an BIOS,27.x Mh/s with fix