I recently upgraded my father's music recording computer from a 2.66GHz P4 to a 3.06GHz P4. Both chips have a 533MHz bus speed. The clock speed increased by 400MHz, and the idle temperature increased by 10°C! What's worse, the CPU now reaches 77°C under heavy load, and it NEVER used to go above 60°C under ANY load before the upgrade! I'm using a heatsink with a huge copper base, silver thermal paste, and a 92cm fan to cool it with. The power supply is P4-compatible and puts out 450W. It powers the motherboard and CPU, two hard drives, two CD drives, a mouse and keyboard, and a couple of USB hardlock keys. Is there a justifiable reason for this huge increase in temperature? Are the 3.06GHz P4's known to run really friggin hot or something?