Under the Performance Tab, there is a "AMD CrossFireX" page. If you were running say 2, 3 or 4 6970s, you can pick how many gpu's you want to run in crossfire, or just use one GPU. This was neat for a game like Black Ops which ran ok with 2 GPUs but *** the bed with 3. With a 6990 there is no options whatsoever. None.
Still he says for the 6990 there isnt an option ..
:-(