I had my Powercolor 4850 at 750 and 1150 with bios flash with bios vgpu set 1.4 if that stuff works or not. And 3dmark06 15180 in vista with q6600 @ 3.6

I have a TT Duorb installed on my card. Auto tune went to 690 and 1153 completely stable.

Would a volt mod make the 750 stable then?