Every time I use the new fullscreen mode and activate crossfire ( two 7970 GE) I will get a game freeze after a couple of minutes of game play. I first tried in eyefinity mode, then I went back to a single monitor. Either way I had a freeze within minutes. whenever I disable crossfire and go back to fullscreen windowed mode I no longer have issues with freezes. I have not yet tried to play in fullscreen and disable crossfire so I do not know if it is a problem with the new fullscreen or just crossfire.