No idea if/how this would apply in this case, I have 2 cards with 4 monitors in my current rig, although currently using just 3 screens.
You can run 3d aps (games etc) on the 2 screens on the main gfx card without issues, but throw WoW or something else on one of the other 2 screens and you get a massive performance drop, I'd only ever planned to use the 2 screens on the main gfx card for 3d apps etc as I'd read about this in advance, but I have no idea how it'd affect the kind of setup you're talking about...
Unless someone has endevoured to resolve this issue lately?

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