VF900 Zalman, assuming it is the 8800gs rebrand (G92), and not the cut-down 9600gt (G94).
I have one on (now my friend's) 8800gs. Kept it cool, and silent. I paid 20usd for it, but they run for about 35usd at Fry's.
Temps never exceded 45C, even during 24/7
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