how much would a socket 939 cpu cost me? something like 3ghz or more + what are the best cpus, amd or intel?my specs are amd athlon 64 3000+ 2ghz, 256mb ddr pc3200, k8vm800 motherboard. i want to upgrade to something closer to 3ghz or more, + an sli motherboard with corsair ram..but i dont know what to go for or how much it would cost...please give me advice