Hi, As some of you may remember, I was on the scrounge a while back for a P4. I never did find one so, I started looking @ buying a (shock) new one but never got around to actually buying it. Anyhoo, I'm now in a position to buy but can't find the right CPU - it's a 400 Mhz FSB board and the slowest P4 I can find is 533. However, I can find Celerons with a 400 Mhz FSB. My question is, do you think that I'll encounter any issues using a Celery ? The main difference appears to be the amount of cache onboard. Alternatively, would I be able to use a Socket 478 533 FSB P4 but obviously it would have to run @ the boards speed of 400 -- Cheers, *Paul* IBM: I've Been Misled