PS. There are 2 2.5 Ghz 400mhz fsb chips on Ebay right now for $37 and a bunch of 2ghz for $7 with free shipping. Even the 2ghz with 512mb cache will kick ass on the celerons 128mb. Also bumbing up the ram to 2 GB will do more then the cpu upgrade. I had a IDE to SATA adapter that plugs right into the mother board and dropped in a 500gb SATA drive I pulled from an old external USB drive. Those old dells are work horses and are easy to soup up. You can put in any 478 chip pentium or celeron as long as it's 400mhx fsb. If you were to put an 800mhz fsb pentium 4 3 ghz chip in that would even work but it would only run at 1.5 ghz because of the clock multiplier but the added 512mb of L2 cache would still cream a 1.6 celeron.