This weekend I was playing some Grid and messed around with 3dmark Vantage. After two races in Grid the system would lockup and lines displayed all over the screen. Rebooted and checked out Event Viewer to see there was a error stating atidiag stoped responding. Pulled out the Gecube 3870 and then everything was fine. Later I threw the Gecube back in and connected the crossfire bridges to try out some 3dmark Vantage only to be welcomed with stretching(ugly..Especially in the 1st GPU test). Pulled the Gecube out and everything was fine. Tried each card individually in PCI-E slot 1 and 10(blue x16 slots) and not a problem. Tried crossfiring them and back to the problem. Tried the Crossfire bridges 1 at a time and found if I connect the first CF connections on the video card I have the problem but the second CF connections work fine. It sounds like I have a video card issue but in this case makes it kind of hard to determine. Should I waste money and RMA both of them or just live with what I have!