Ok. I have a motherboard with a Core 2 Duo 3.16ghz, 6 gigs of ram, and 550w power supply. I currently have a 9400GT since i only have a PCI Express 1.0 16x slot. So here's my question. Either what's the most powerful card I can buy for a 1.0 slot, or, although I know buying a PCI-E 2.0 card can still work in a 1.0 slot, are there benefits from buying the beefier card? Ultimately without replacing the motherboard yet, I want a graphics card that can do more, a lot more than my 9400GT. Any ideas? Suggestions?