Well their whole plan is to get Quad SLI into consumer's households, but due to driver problems, the initial release of the GX2's will only allow one GX2 to run on a motherboard until driver revisions come out enabling Quad SLI.
cant believe you need sli to have the card. nVidias mistake, i bet they will lose customers due to that. But the card looks like it has such a gain since the released 7900GTX. Cant believe it hs 1g memory. It looks awsome.