I just finished building my first PC and am still new to video cards. I installed a Nvidia 7200GS with 512MB of DDR2 RAM. This card actually lowered my Windows Aero & Gaming scores from the mobo video card (Nvidia 6100). I am now looking into upgrading to another card and need some advice. Would I see any difference in going with a 7900GS with 512 DDR3 RAM? Or should I bite the bullet and get a 9600GT with a larger power supply? I forgot to mention my mobo is PCI Express 16X (not 2.0).