I tryed 3 BIOS, original, one ASUS and other EVGA MOD from here (POWER MOD), and was pretty similar all, my GPU is under WATER, i dont have issue with TEMP, max temp is 45C. The limitation for my OC is the Vgpu, +34MV is too small, with that Volt i can run 2011 at 1241MHz.

Nacho