PC Stats reviews MSI’s NX7950GX2-T2D1GE, which is 2 single GPUs on full cards with one PCI-Express 16x connector.  That means if you can get 2 of them, you can have a Quad-GPU setup.  Follow the link to find out what one of these can do.
“The GeForce 7950GX2 is nVIDIA’s flagship graphics card du jour, and the first true dual core, dual slot PCI Express videocard from the boys in Santa Carla. While there have been a handful of single card dual GPU videocards introduced, these have all been brand specific attempts (like the Gigabyte GV-3D1 dual 6600GT and GV-3D1-68GT dual 6800GT). The GeForce 7950GX2 brings SLI power to every PCI Express platform! For SLI compatible motherboards (and anyone with really deep pockets), it’s possible to run two GeForce 7950GX2 videocards together in SLU for a total of four GPUs rendering simultaneously! That’s just ridiculously sweet!”

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