how much would it cost to go from an amd athlon 64 3000+ cpu to an amd athlon 64 x2 4600+ manchester 2000mhz ht2 x512kb l2 cache socket 939 dual core?. my motherboard is asrock k8 upgrade vm800 socket 754, + i want to upgrade to the asus a8n sli premium socket 939 nvidia nforce4 sli atx amd motherboard. also the asrock mobo i have has a future port for a socket 939 board, what is this for? is it for an asrock socket 939 mobo?(would it have sli?) if so would this be better option than the asus board? any help is always appreciated...thank you in advance