Umm, your confused...
Quad SLI is 2 GTX295 cards, not 4. 3 separate cards is the most SLi supports (Tri-SLi), however the GTX295 doesnt work with that. 2 is the most GTX295 you can put in and still use SLi.
+1. Two GTX295's is quad sli, since it is two GPU's together, I think.