PCI-E 3.0 is only available when you install a IB CPU, likewise theres no cause for concern if you have a PCI-E 2.0 graphics card and a IB CPU. For the record, from what I've seen PCI-E 3.0 is only really of any help with a GTX680 or better. Differences aren't significant otherwise, we are talking literally 2-3FPS in most cases.