Originally posted by: Schadenfroh
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Let me first say that I own the same card you will in a couple of days, and you'll love it. An eVGA 6800nu.
With that said, I am currently overclocking my card with very good results. I use the original Coolbits, but the Coolbits 2 link that Shadenfroh provided will work as well.
The default clocks on this card are 325 core and 700 memory. I am stable as hell right now at a 380 core and 810 memory. YMMV. After some rough (i.e. not stringent) benchmarking in 3DMark03, I found this overclock gave me around 200 to 300 extra marks over the default clocks. This may yield you an extra frame or two in your games, but nothing major.
Good luck.