So I was given a 20" 2.4/2/500 iMac (7,1). I turned it on and installed iStat to check out the temps. The CPU hovers around 25-30*C...I also have a MBP and the CPU temps in that range for that laptop are unheard-of. Fans are set to 1,200 RPM btw. I also threw some heavy flash videos and games at it...nothing. 35*C CPU In my MBP, it would be 80*C+ easy.