easy pentiun 4 socket 478 fsb 400,533,800 xtreme edition(3.0ghz)clockspeed under 3.xghz socket 775 fsb 800,1000,1200,pci xpress 16x,ddr2 clockspeeds 3.x and higher. amd socket (A) 462 fsb 166,200,266,333,400 xp,semprons,durons and t-birds top speed 2ghz ddr,dual channel. socket 754 fsb integrated into chip(800mhz) L2 512kb 2800+ thru 3700+ speeds 1.8ghz-2.2ghz nfoce 3 150,250,k8t880 via ddr agp 8x socket 939 fsb 800mhz-2000mhz L2 cache 512kb-1024kb 3200+ thru 4400 or higher series+ speed 2ghz-2.4ghz a64,a64 fx,fx-53,fx-55 (all with 2000mhz fsb,1mb L2 cache)spd 2.4-2.6 a64 x2 dual core ddr,pci xpress 16x, nforce 4 sli. base on the socket you can choose. but i recommend choose by reading forums reviews etc... hope i help
its just room for future uogrades as in a amd s754 amd64 3200+ runs at the exact same spped as a s939 3200+
