Well, I'm looking at upgrading my second computer (got the video card knocked off thanks to the board). The last thing to go (256 mb of Ram, 40 Gig Hard Drive) is the CPU (a meager 566 Celeron). My question is, do I have to buy a new mother board to upgrade to say, a Pentium 4 or even III? Do I have to upgrade if I plan on switching between brands? I can't say what brand or model the mother board is (though it is an old E-Machine), but I really would like to upgrade the CPU. If I have to replace the motherboard, I'm not getting out for under $200. If I can just buy the CPU (be it AMD, Pentium III, or even 4) then I can get out around $100. Thanks again guys.