Okay so my graphics card is EVGA GeForce 8800GT 512mb GDDR3 KO 675 core / 1675 shader clock / 975 memory clock. I've downloaded EVGA Precision software. Seems really easy to use. But could anyone explain exactly to me how to use it so I don't do mistakes. And what temperature would be just about okay? At the moment it is 65 C. Also if I overclock it will I see difference playing games? Thanks for all the answers. Highly appreciated.