Anybody see that video at Toms Hardware a while back where they showed P3 / P4 / AthlonXP without cooling? They unclipped heatsink whilst running Quake3 arena...
P3 800MHz : Overheated to in < 10 seconds. Whole system crashed but chip unharmed due to thermistor triggered critical stop.
P4 1GHz : Overheated in < 7 seconds but did not crash. Core speed repeatedly halved until processor was operating under its thermal limit. Game dropped from 180fps to below 5fps :-)
Athlon XP 1600 (actual speed 1.2GHz). Overheated in similar time to P4, system died. Surface of chip blackened around die and blue smoke could be seen. Totally wasted!
Keep an eye on your cooling AthlonXP users!
PPC cooler than x86 in every way that matters ;-)