Hi Apneal, could you tell me what driver version you're running? I built a bunch of sapphire nitro+ 470 rigs last december and had no problem modding bios. I just got a Sapphire Nitro+ Rx 570 4gb w/hynix, and no matter what mem straps I use, it never goes above 24.5. It's really odd. Asic is high, core/mem at 1200/2100. Stock gives 22, so the bios mod is working (gives 24.5), but that's still way too low. Win 10 64 bit, MSI AB for clocking/-100mv. I'm at a loss. I've tried 1xxx, 2xxx, and every combination I can think of for straps, including your suggested 1425 up. Latest drivers are the only ones I have tried: 17.5.2  I'm starting to think I need to go find a recent but older driver version.