Not sure exactly...while at idle doing nothing I checked in the BIOS and the temp was 100* even. After being on a few hours and playing some UT3, I restarted and checked in the BIOS and it was fluctuating between 107*-109* which doesn't sound very hot at all from what I remember of my Socket A days. I haven't loaded a program to monitor temps in Windows. What's a good program for that these days?