The guys over at Hexus posted what seem to be photo's of the PCB for a dual GeForce GTX 480 GPUs, yikes imaging the power and heat. Two GeForce GTX 480 GPUs (GF100-375-A3) are connected via a high-speed NF200 bridging chip, the what appears to be MARS II would absolyutely dominate and swallow everything in it's path.
Each GPU's six 64-bit memory controllers are serviced by, we imagine, double-density, double-width GDDR5. Three eight-pin PCIe connectors provide enough juice - to the tune of 450W-plus, it is reasonable to assume - and we're guessing that the sheer size of the proposed cooling would make the ARES' blush. Indeed, it wouldn't be surprising if this was a watercooling-only product.
Should this product come to bear before the next round of GPU updates, the MARS II would be the baddest - and undoubtedly most expensive - graphics card in the world - Hexus
Check the thumbails to see the beast a little bigger. Oh and to ASUS .. we'd so much like to recommend liquid-cooling (!)