Also, you probably should just retrofit the whole system. If your case is ATX, then you can buy a new motherboard for around $100.
An AMD 1.4 GHz Processor (266 MHz FSB) is $99. A few months ago they were $200 and before that the were $300.
750 Mhz Durons run about $29.
AMD Duron Compatible Motherboards can be had for $45.
Check out [url]www.pricewatch.com[/url]
If you are using PCI cards and an ATA Hard Drive you'll only need a new Motherboard, Processor, and Memory. For $74 you could retrofit it to a 750 MHz Duron with 128 MB of RAM. of course you have to add shipping and handling so it be more like $100.