I have a stock 2.4ghz P8600 unibody MBP. windows: ------------- My first test is on stock bootcamp drivers in Windows XP running 3dmark 06. Ambient temps are around ~65 F or ~18.3 C I recorded temps throughout the benchmark (GPU-Z and CoreTemp) and the temps on the GPU and CPU reach temps of 95 C on both. I ran the benchmark several times and each time with the same result. Idle temps seem to be around 63 C for the GPU and 55 C for the CPU. What I did notice was that even after running the benchmark several times - the fans never got to an audible level - my guess is that the fans never made it over 4k rpms. *My judgment on fan speed is entirely unscientific as I could not find an app to monitor fan speed in windows that played nice with the MBP. The fan speed was judged by comparing audible levels to the levels in OS X, where I used iStat pro to monitor the fan speeds. While the body certain FEELS alot cooler than my classic MBP with the 8600gt and merom CPU, the temps were actually higher than I ever got when I ran stress tests on my Classic. I ran a heavily overclocked 8600m gt @ 590/820 (higher clocks than the stock 9600m) and the GPU never reached over 87 C - but the fans would be blaring after about 15 minutes of intense use. The CPU (stock) on my 2.4ghz merom never reached over 92 C when fully loaded - but again - the fans would be blasting when stress tested and temps would level off at about 90 C. Running prime95 with Small FFT's (windows' version of dev/ null") for about 15 minutes - the temps reach 95 C on the CPU (90 C on GPU), before the fans kick in at a low audible level and brings the temps back down to about 80C for the CPU and 76 C for the GPU (prime95 is not a GPU stress test). The low audible level for my fans is about 3.5 - 4k rpm. os x: ------------- Same ambient conditions as above - I ran dev/null for about 20 minutes with the 9600m active. The CPU gets up to about 90 C before the fans slowly kick in - and they reach about 2900 rpms - which is nearly inaudible. The fans never reach higher than 2900 rpms and the temps are stable at 84 C after about 5 minutes. The GPU never makes it over 83 C and hovers around 67 C for the GPU, 76 C for the GPU diode. the tests lead me to think the fans are too conservative in windows - but are much better adapted in OS X. -------------- It seems when the fans do kick in, they are very adequate for cooling. However, the issue in windows seems to be that the fans don't really kick in until the GPU/CPU gets dangerously hot. I'm interested to here what others' experiences are with their unibody MBPs.