I have a computer with a 1.5 GHz processor and another computer with a 1.6 GHz processor, both Willamette core Pentium 4. What route should be done for upgrading, a Pentium 4 or a Celeron. Both computers only work with a 400 MHz FSB, so either way, I'm limited to a 2.8 GHz processor. I know that the P4 has a 512 kb L2 cache while the celeron has a 128 kb L2 cache. My question is, is there a big enough performance difference to justify spending a lot more money on the P4 or can I just purchase the celeron and not suffer a big performance hit? the_guy