I have never experimented with duel cards before. I'm using a nForce 780i SLI mobo and 2 Geforce 9600gts. Do I have to set anything in bios? SLI-Ready memory or something?
My 7900gs dueled my old 9800 pro. The ATI card go owned! I think there is still a sword in the chipset.
Sorry I'm still not funny.
As for your mobo, it might have one of those cards that you have to flip around into the SLI position. Other than that I don't think there is a lot you have to do.