I tried the ASUS bios and ATIFLASH would not flash it. After I posted, I tried again with the -f option and it worked. So now I can successfully OC my card. Still, I got rather poor OC results, only 823/1150 GPU/mem. Overclockers Club got 870/1220 from their Sapphire 5850 card. What OC are you getting from your XFX?