its fairly easy to overclock the 100mhz fsb p2's
i got my p2 400 to 600mhz, i got it at 650, but after running prime95 torture for 13 hours it locked up every time, you just need to freeze your cpu to get it that high.
my p2 is running at -14c, lol, i have 2 150 watt pelitiers and a waterblock on it.
the fsb is set at 150 mhz right now ( i have some PC 150 ram though) i tried going to 155 but its not stable after running prime95 for a while