I tried to change Voltages on an Asus 4850 using RBE v1.15 with no luck, card works on 2d (DOS) but hangs when booting OS.

The card is non reference, has the Glaciator cooler and the 3 phase design used in some Asus 4850 Top cards, also CCC limit for GPU is 800 in the original BIOS.

Is this BIOS unmodable for VGPU?