http://www.techpowerup.com/95445/ASUS_Designes_Own_Monster_Dual-GTX_285_4_GB_Graphics_Card.html
ASUS has just designed a new monster graphics card that breaks the mold for reference design GeForce GTX 295, called the ASUS MARS 295 Limited Edition. The card, although retains the name "GeForce GTX 295", same device ID, and is compatible with existing NVIDIA drivers, has two huge innovations put in by ASUS, which go far beyond being yet another overclocked GeForce GTX 295: the company used two G200-350-B3 graphics processors, the same ones that make the GeForce GTX 285. The GPUs have all the 240 shader processors enabled, and also have the complete 512-bit GDDR3 memory interface enabled. This dual-PCB monstrosity holds 32 memory chips, and 4 GB of total memory (each GPU accesses 2 GB of it). Apart from these, each GPU system uses the same exact clock speeds as the GeForce GTX 285: 648/1476/2400 MHz (core/shader/memory).
This is pretty beefy. I'm guessing it's a lot like a Radeon HD 4870 X2 in that you don't need an SLI board to use it.
I would be very interested in seeing what kind of performance people get with 1 or 2 (Quad SLI??) of these cards.
Now we just need TripleHead2Go to add support for 3x1920x1200 and we'll be set.. :D