Running a second or third video card for secondary/multi display duties can work.
Sometimes.
If you guys had tried it before, you'd understand why i don't consider that a valid option.
I've sucessfully done that to display four displays with my old A8N32-SLI Deluxe.
I was absolutely not successful doing that with my P5B Deluxe, & i tried countless different cards & drivers.
My buddy tried the same thing with his current system without success.
Neither AMD/nV support running different cards in a system, so results will vary from functional to absolutely impossible nightmares.
Anyway, this is a bit off topic...