I'm getting 29.xx with my Asus RX580's after Anorak.tech bios mod. I'm not even "tweaking" the bios; just downloading already modded ones. Hell, the Sapphire RX570's hit 30.1x Mh/s. Wish I would have bought more. I'm just now getting around to GPU's that have been sitting in Newegg shipping boxes for a month waiting to be opened and modded.