For what it's worth, my AMD 6950 Crossfire has had 0 issues and runs wicked fast. Metro 2033 at max settings @ 1080p at 60 fps. Faster than GTX 580 at the same price. In the case of Metro 2033, 50% faster.
http://www.anandtech.com/show/4061/amds-radeon-hd-6970-radeon-hd-6950/15
All you do is put the cards in the mobo, connect 4 power connectors, and a ribbon between the two GPUs. That's all I had to do. It just works.
http://www.anandtech.com/show/4061/amds-radeon-hd-6970-radeon-hd-6950/15
All you do is put the cards in the mobo, connect 4 power connectors, and a ribbon between the two GPUs. That's all I had to do. It just works.