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Almost regardless of what you're trying to accomplish, the 3 cards in sli (which is what I run in my setup) will beat anything that's possible if you drop one card to just handle physx. Last time I checked it out, there's very little support for physx 'out there'.
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I wonder if his multi monitor setup with throw a wrench in the spokes....
I tried this once (not with 2 cards in SLI however) when I upgraded to my GTX570 using my old GTX260 card as a dedicated PhysX card. I quickly ditched the idea when I saw absolutely no increase in performance in the games I played. I would say that unless you play a game that directly supports PhysX then just run 3-way SLI and enjoy more overall graphics power. It really is a waste of a GPU for dedicated PhysX.