I have another question about the motherboard. I am getting a Sapphire 7950 Vapor-X and I was wondering if this was also compatible because it said PCI express 2.0 for the motherboard and 3.0 for the card and I don't know what that means.
It will work just fine. It would work better on a PCI express 3.0, but you won't notice the decrease in performance. You are probably looking at a 1 FPS drop. But on a multi GPU setup 1-3 FPS drop. so you're ok.
Benchmark of a GPU(s) on a 2.0 and a 3.0. as you see its very unnoticeable.