Overclocking video card standards?

I was wondering whether there are any established benchmarks and standards for the nVidia geForce 8600 GTS card, and to what point would the performance remain optimum as one overclocks their GPU. In addition, how exactly would (safe) overclocking cut into the operational life of the card?

Thanks much!

P.S. recommend any programs? Or should I just tweak with the registry?

Answers:
it is usually pretty safe to perform a 10-20% OC on nvidia cards (that's what BFG does then they sell em haha)

You would notice when performance falls off as when you are playing the game you will start to get "artifacts" on screen. They are little specks of garbage that shouldn't be displayed. If you overclock and you see that, turn it back down a bit.

Operational can be affected, but if it under a 20% OC, you would probably have a new card before anything would ever go wrong.

You can use coolbits which unlocks the OC features in the already-present nvidia display program that comes with the drivers

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