NVIDIA has been talking publicly about Quad SLI for half a year now, and Quad SLI configs have been shipping for a few months in a select number of ultra-high-end PCs. Today, at long last, NVIDIA is unveiling a consumer version of its Quad SLI component card, the GeForce 7950 GX2.
A single GX2 plugs into one PCI Express slot, but it actually has a pair of printed circuit boards, two GPUs, and two sets of memory chips onboard. By itself, the GeForce 7950 GX2 is an SLI setup on a stick, a dual-GPU powerhouse that fits into the same space as any other high-end graphics card with a dual-slot cooler. Slide two of these puppies into a system side by side, and you have the potential for Quad SLI, the only thing stopping you however is that NVIDIA seems to have no plans to offer this on retail but only through OEM partners such as Alienware, Falcon Northwest, etc.
Still the GeForce 7950 GX2 seems to be the fastest 'single' card available, and some reviews are up at: Tech Report, nVnews, Legit Reviews, and Hexus.