I'm looking to buy a GTX 670 OC 2GB Edition separately from the PC. But I'm not sure if the motherboard supports it, I've done research but am still not sure. If the Gigabyte motherboard doesn't support this card then the other option I have is the Asus M5A97 V2. The GeForce website says it needs PCI Express 3.0 and dual slot, This is important as I am ordering soon. Thanks