Can I use a PCI Express 3.0 x16 Graphics Card in a PCI 2.0 x 16 slot? | IGN Boards
No, PCIe version isn't a bottleneck, more of a speed limit. A bottleneck is something restricting something working the way it should be. With current cards you won't see a noticeable gain with 2.0 vs. 3.0 and tests have shown some games actually perform ...