I have a ASUS M2R32-MVP. Are the PCI-X slots 2.0? I have an HD3870x2 and want to upgrade, but i see all these new cards are PCI-X 2.0. I was thinkg about maybe upgrading to x2 HD4870's. What do you guys think? or 1 GTX280? I like to have over 60fps in most games and i use a res 1920x1080. Thanks in advanced.