Tualatin Celeron 1.1A running at 1.46GHz, about 36-38C idle, using retail box HSF. I had a Tualatin Celeron 1.0A running default speed with a Coolermaster HHC-001 (68k RPM fan, all copper, heatpipes) which basically idled at room (motherboard) temperature, or 1 degree over.