For those of you who feel like picking on Intel some more here is one more thing to wonder about. According to a post on IXBT when the P4 starts to run hot it will actually cut back to 50% speed to save heat. Anyone had their framerate go to poop while playing on a P4 suddenly? Thanks Eric & /.. update: HardOCP actually talks a bit about this and has a statement from Intel saying basically you'd have to do very mean things to get the throttling to kick in:

You can run benchmarks all day on a Pentium(R) 4 processor with the benchmarks unaffected by the thermal protection circuitry. The key is to have a robust heat sink and thermal solution. With the heat sink setup we designed for Pentium 4 processor systems, I have yet to see thermal protection kick in. George. [snip]