You have the wrong cpu or dell model number listed. The original 2350 uses socket 478 400 fsb cpus. The celeron 430 is socket 775. The 2350 can run a p4 400 fsb 2.4, which is listed on pricewatch at starmicro for $22, or the cheaper 2.2 which is $9. It will not run any 533 or 800 fsb p4's, due to the chipset limitations.