I have an iMac with 6970M 2GB which has been excellent for games I run via bootcamp on Windows 7 .. But after an hour of gaming, I feel the back of iMac chassis become quite hot. Yes, I know it's normal, and I have installed smcfancontrol on OSX, I improved fan speed on each HDD, ODD and CPU. But still, quite hot nonetheless. My question: If I deactivate smcfancontrol on OSX, does by default iMac will AUTOMATICALLY adjust fan speed? increase while it's hot or decrease while not on Windows Bootcamp? I game almost 2 hours and I didn't notice any fan speed increase or changing, although it's hot. Does iMac's fan will remain the same until it's exploded because of heat ? I'm kinda worried with the heat. Although many said that the chassis would act as giant heatsink and supposed to be hot when I use it for game. Should I turn off smcfancontrol? Letting the iMac decide by itself? Or should I worried?