Can i replace nvdia7600gs "ddr2" graphic card with nvdia gt220 "ddr3" ?

It would have to fit in the same slot as the existing display adapter. So if you've got an older AGP motherboard (there was AGP1 and AGP2, btw) you'll need to hunt down a card that'll work in that slot. If you've got a newer motherboard, it's most likely has PCIe slots.|||dont see why not..check the specs on your motherboard