I recently cracked my 500E i was using for a year at 776 so I went to my local comp store and bought a retail 667 with a 133 bus. But the highest I can overclock is 675- 135 x 5 / 33 pci bus. When i put it on the next setting past the 33 pci bus, win2k doesnt load saying that some file on the hd is corrupt. Also when i try to load winme, it says there is something wrong with the registery, it fixes it and then reboots, then does the same thing again. When i bring the pci back down to 33 everything works normally. Would that be corrected if I formatted and reinstalled windows? I can boot the comp at most 750 with windows getting errors during startup. Did sandra and a duron 600 beat this comp in the cpu benchmark, think im gonna get a kt133a and a tbird, scrap intel.