The memory interface itself is split between the two processors, meaning that each processor gets direct access to the memory at any given time.
The processors themselves are 576MHz NVIDIA GeForce GTX 295. It's supported by a total of 1792MB of DDR3 memory that runs at 2GHz. The memory interface is 448-bit per processor, meaning that each of the two processors gets a full 448-bit interface with the memory. The card fits into a standard PCI-E slot, and has VGA, HDMI, and two DVI-I outputs.