Suppose the 990 performs better. 970 is cheaper. 990 more likely to support future chips. The official MSI site says 2x PCI-E 2.0 at 16x. here http://ca.msi.com/product/mb/990FXA-GD65.html#/?div=Detail
Ok man, So i would buy the msi, becouse of the two pci-e (in the future SLI with gtx 660OC or 760OC) and to get a better OC in the processor, thanks to all who gave me their opinion and info!