Hello! I have an Asus P5w DH mobo(http://www.newegg.com/Product/Product.aspx?Item=N82E16813131025), and am looking to upgrade my video card. I would like to get the ATI 4870 (http://www.newegg.com/Product/Product.aspx?Item=N82E16814121258) My question is in regards to the PCI express. My mobo has two 16x pci express slots, however the video card says it is pci express 2.0 16x. I haven't been up on computer hardware lately so i'm pretty clueless, will pci express 2.0 work on my mobo? Will this combo work together? If not, does anybody have a reccomendation to some older cards that i can run crossfire, and perhaps get similar results? thank you!