I just put in a Barton 2800 (running at 2.088 ghz) and I was surprised by the temp being so low. It is running at 40C. It is just 2 degrees higher than my mobo is running. Bios was giving me an extra 10 degrees on it until I updated BIOS (Asus deluxe). I did not use Arctic because it had not arrived yet but went ahead and mounted w/ heatpad and I don't think I will bother changing it now. Still having problems with the ethernet onboard and no one seems willing to help... ... JFYI...