AMD X4 640 - New Motherboard and RAM - Replace K10N78D OR Am3 with 4x DDR2 Slots

If you want to keep the CPU, just get a recent AM3+ board and 2x4GB DDR3 RAM. The newer board will give things like SATA6/USB3 which I'm guessing yours doesn't have.
 
Yeah, don't bother trying to fix up a system without those and stuck on DDR2. It's not worth it. If you get a 970 board you'll be able to upgrade to an FX processor later too.
 
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