The reason AMD's processors are so cheap is because of the way they manufacture the processors. Like I think its an Athlon 4000+ that is just a FX-55 without 1mb of cache. They make the chip, test it for cache, if it was 2mb then they label it an FX-55, if it tests for 1mb then they label it 4000+, it it has nothing, they mark it X and it goes in the AMD Garbage bin ^___^
It's kinda shady, but it works. Big name OEM pc makers like HP and compaq are using Semprons instead of Celerons for their budget "Future Shop customer" line of computers. The only real PC maker that is faithful to old blue intel is Dell. Our school computers use LGA776 2.66ghz celerons with the BTX motherboard standard. Man... do they suck or do they suck =(