I have seen other posts about this, but none seem to answer my questions. I'm sorry of this is the wrong place to ask (none of the other threads seemed appropriate to me), and if the post needs to be moved, please feel free to do so! I have a white 2.16 iMac, and I noticed it was running hot, so I did a little research and I downloaded smcFanControl 2. I upped the fan speeds (CPU 2000, HDD 2500, ODD 1500). The machine runs a tad cooler, but I am wondering if this was a safe thing to do. If it is, I am wondering what the optimal fan speeds are for my particular iMac. Does anyone know? I would really appreciate the advice. If it's not safe, I will of course remove smcFan Control. Thanks! Oh, according to iStats, these are the current temps with the new fan speeds: CPU A: 52 degrees GPU Diode: 49 degrees Ambient: 26 degrees (no, the iMac is not boxed in, and it does not feel that hot in here) Memory Control: 46 degrees HD Bay 1: 40 degrees Optical Drive: 37 degrees HD: 38 degrees Are these safe temps? My CPU is cranking cuz I am doing SETI and Folding. Thanks!