Categorically - Yes.

http://forums.dayzgame.com/index.php?/topic/157429-slicrossfire-support/

i've explored this in great detail.

kakan - Try running one card then try two. There is no performance gains. This is documented by hundreds of people trying to increase their FPS through the use of the 2nd card and the Game and the eyefinity profiles literally don't support it at the moment.