So i just recently installed a 2nd 6950 into my system, before i added it i didnt have any issues but after i added it ive noticed that the screen is tearing and kind of looks like it does when you have a bad coaxial connection on a TV. I have used 2 different DVI cables and nothing changes.
My monitor resolution is 1600x900. Is it that the 2 cards are just too beast for that resolution or could it be the Crossfire Bridge.
If it's like the above, that is tearing. The reason you see it now and not before is that with higher FPS, you are more likely and at high enough FPS guaranteed to get tearing. And like the poster above, v-sync is your only option to stop it.
The reality is, you might have more horsepower than you need for that resolution.
That is a serious graphic solution for 1600x900, you could buy two 24" 1080P Monitors and still get ridiculous frames on both screens lol. I would think that the CF setup is tearing because of the low resolution. But similar to above try to turn Vsync on and that should help, if not buy a newer monitor your eyes will thank you for it later.