my 8800 (not overclocked) does 53-62 idle (with stock cooling in a caase thats not that great) and 57-65 under load, under really really really (crysis on max) heave load its up to ~72 which is a bit too high but it comes down after a few seconds as when it gets above 60 it goes up from 30% fanspeed to up to about 50% depending on how warm it is.