Hello fellow rigbuilders, Maybe one of you can point me straight into the right direction. Recently I upgraded my system with 2 XFX HD6990 cards. I experience strange flickering, rolling in certain graphics mode and some games (Crysis 2, BF3) are unplayable. Now I read in different fora that that could be driver related but I'd like to now if maybe one of my 6990's is broken. Maybe someone can look at the enclosed video of the problem and can tell straight away what it is. http://www.youtube.com/watch?v=Q-1AaIvdyZI&feature=player_embedded This is a 3DMark11 benchmark! Thanks in advance.