You will need GPUz
(to back up bios )and nvFlash
Good tutorial here
Recently done this to add voltage increase control to my card for overclocking
If you are not sure, it's something you need to read up on carefully - you don't want to end up with a bricked card. The forums are a great resource for this.
Good luck Edited by ydna666 - 12/23/10 at 3:43am