I have an AthalonXP 3200+ not overclocked on a new motherboard. It is an Asus A7N8X-E Delux. I have a case fan in the front, and one in the back. They are the same (about 3000RPM). I also have a ThermalTake SilentBoost fan/sink (2500RPM). I am running at 51C under load, and 47-48 at idle. Is this normal? It seems a bit high to me.