I would bet that 2 X850Xt will beat 2 nvidia 7800 in this game any takers. This is the first review I seen anywhere that a N 6800 beats a X850 Xt . If there are more please post a link to that review please.
http://www.anandtech.com/video/showdoc.aspx?i=2477&p=5
http://www.anandtech.com/video/showdoc.aspx?i=2477&p=5