"What you are looking at is a prototype graphics card that pairs
two of the Fermi-based GeForce GTX 470 GPUs on a single PCB. The small
chip in the middle (green) is an nForce 200 PCIe bridge chip that converts
the single PCIe x16 connection into a pair of connections, one to each GPU.
Yes this is a beastly board and no they wouldn't tell me the power
requirements of such a solution were."
FULL STORY @ PCPER (http://www.pcper.com/comments.php?nid=8889)