After hours of playing HL 2 I can manage to crash my 20" intel iMac with what appears to be a heat related issue and the BSOD is garbled. The iMac is extremely hot and the metal on the upper left corner is quite hot (not warm). I didn't think I would need a fan controller since I didn't have the macbook anymore. So I installed SMC fan controller and cranked them up. Holy crap is it loud. It never got that loud or ran all 3 fans that fast before the overheats. Why? It can push a lot of air, but instead it didn't move the fans up and it over heated. But regardless of the reason why I'm guessing windows just doesn't use the same controllers for the fans as OS X does. What speeds do people have there 3 fans set to while gaming in OS X or windows? (If you boot into OS X first, then restart it keeps your settings for the fan speeds). The three fans I can adjust on my iMac are the video card, the hard drive, and the CPU. Defaults appear to be Video card 1000 RPM Hard drive 1200 RPM CPU 1200 RPM As another question how do you move the settings to even numbers such as 3000 RPM? I can't do it with the mouse as it moves a bunch of numbers at a time.