I am confused on what memory my motherboard/processor needs. I put a new CPU in my system and the new processor has 800Mhz FSB as opposed to my old processor having 533Mhz FSB. I figure I'll go from 1GB to 2GB memory. Should I be buying PC3200 or PC6400? Which one will my motherboard support? My motherboard is ASUS P5S800-VM and my processor is Pentium 4 670 3.8Ghz.