I recently bought a 2007 iMac on CL and installed istat. It's showing my fan speeds as 1200 rpm and while they may go a tad bit lower they never go any higher than that. Is that the fastest they'll go? Just wondering because it is doing the freezing thing I've read about with this model and I want to make sure this is not causing it. Temps seem to look ok except Airport Card at 69º and GPU Diode at 62º. I am watching The Office on nbc.com right now though.