I recently bought a pair of ATI Readon 5870m's for my Alienware M17x R2. After installing it, I noticed a huge issue playing Far Cry 3. I assumed it was an issue with Far Cry 3 and CrossFire. Major "flickering" or "shuttering", the whole screen not just shadows. Disabling CrossFire fixed the issue. After I finished the game I re-enabled it, went to play Planetside 2, same thing.
Downloaded and ran Catzilla (new benchmark software).
When Crossfire is DISABLED, I get better score then when it is ENABLED. The flickering occurs during the benchmark test as well. I managed to capture it on my phone.
Also there is a "fluid test", and it looks better with CrossFire DISABLED, then with it enabled. I have these video files uploaded to Google drive:
i'm afraid it no one mighty be able do anything.
cfx or sli are just not worth it in games.
it has issues like micro stuttering, cou bottlenecking, driver problems etc.
a lot of people have given up on sli and cfx.
and does your motherboard have 2 16x slots? that might be an issue. what is your cpu?
but again cfx is just not worth it