Good Gear Guide
Double the trouble: ATI introduces a new dual-GPU ...
Two GPUs sit on either side of a controller with a 16 lane, PCIe 1.1 bridge. Effectively what you’re looking at is a single board Crossfire configuration. The one advantage of this is that you get Crossfire benefits such as alternate, split or tiled frame rendering.
Double the trouble: ATI introduces a new dual-GPU board to take on the competition