My boss has a Duron 600 Mhz or something, and tried to 'upgrade' it to a 1300 Mhz.
It wouldn't boot with the new chip 19/20 times, not even to the bios. Also, with the old chip, we looked at the voltages, and the +2.5 read 0.18. Is this important? the 3.3, the 5, and the 12 were all about...