I'm currently running a EVGA GTX260 superclocked on my mobo. It has the second PCIe slot for a second vid card but in the manual for the mobo it is suggesting the use of ATI cards as the mobo supports X-Fire, an ATI product. Can I still add a second card, an Nvidia card to get SLI on this mobo? I think I can but before buying the card I'd like to know for sure. Anyone have any info? Thanks.