The Celeron should have the same amount of cache as the P3, plus it has data prefetch and the really nice heatspreader to keep you processor from teetering on the core. The only thing that the P3 has that the Celeron doesn't is the 133 Mhz FSB, although with proper cooling and a decent motherboard you should be able to achieve a 133 Mhz overclock with no problems either