You're limited to 2 or 3-way SLI with single GPU cards. Quad SLI == 2x GTX295. A friend is running a pair of GTX295's in a P6T7 and gaming with quad SLI.
I run 4x GTX295 cards in a P6T7 folding rig, but this is not an SLI config, a max of 2x GTX295's are supported for quad SLI. A couple of pics of this setup are in this other thread, EK-FC295 GTX Single PCB - Released!.
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