Pentium 4's temperature

P4 chips come with a clever step down facility which allows the CPU to slow down when it gets hot. The CPU will run slower the hotter it gets. The theory is that the CPU will never burn out even without a heatsink/fan. It will just run run at an unbelievably slow pace. ref

I test mine by using MBM5, idle 44c full 57c.

(Full: run Hot CPU Tester Pro 4 Lite)