I ran the CCC auto overclocking utility and it set clock speeds at 690/1125 and I've had no problems so far. I haven't tried to push it any further since heat is an issue. I have the stock cooler with the fan speed set at 55% and it gets to 78c on full load (crysis) which is about as high as I like to see it go. 3DMark06 score is 14047 - haven't tried any other benchmarks. http://service.futuremark.com/compare?3dm06=7427945