i want to install 2gb nvidia graphic card on my pc but i m unable to because i dont know that which graphic card modle will support my pc....!!!! and i also dont know about pci slot of my pc....!!!! my motherboard is ddr2....!!!! plzz help my motherboard is of lenovo. i want to install it for playing games lyk gta4....!!!! i m having 2 gb of ram and my os is windows 8....!!!!