cool. here is a little guide i did for someone else
Download NiBiTor.v3.5a
save your bios file tools - readbios- read bios to file (save as orig.rom)
Then tools - readbios - read to NibiTor
then go to the voltage tab
then click on exact mode. Should say 1.05v Change this to 1.1v
Save bios (new.rom)
Get nvflash and stick it on a usb stick that can enter dos (or floopy) with your newly created bios
Then uninstall nvidea drivers and rivatuner if you have it installed
reboot
Boot into Dos
type *nvflash -4 -5 -6 new.rom* (without the *)
Asks you to confirm - press Y
Flashed
Reboot back into windows reintall drivers etc
Open Nibitor tools - readbios - read to NibiTor
Go to voltage tab and in exact it should now say 1.1v