Wouldn't bother overclocking it if you are finding that games are running great at the moment, which they should be on a 8800 GTX, as there wouldn't be a need to do so unless you just wanted some high scores in 3DMark06. Although just as a note, I tend to find the best tools for overclocking cards is either ATi Tool or Rivatuner. Also, ATI Tool was originally built for ATi cards, but you can use it just find for Nvidia cards.