The p3 700e is probably better. Plus if you do reach +1ghz the system will be running faster than the 750, because of the higher fsb, which, means that your memory will be running faster. I'm running my p3 700@1ghz and I am only using a golden orb to cool it. I can take the cpu much higher with my PEP66 and 72w peltier, but the noise from my 38cfm Delta fan is really annoying, so I don't use it.