currently running a socket 754 amd 64 3200, 2.2 ghz newcastle with 1.5 gigs crucial pc 3200 ddr 400, I only have a limited cash, my question is can I run my old memory in a new dual core system, or do I have to buy ddr2? I would like to save the cash on the new memory, to buy a new pci express video card, thanks, any links or suggestions appreciated, oh by the way not an overclocker..