try any resolution any settings, but you should ask your self. how it got blurry though.
Just try switching to a higher resolution.
lol just try every resolution and decide what is the best for you.
the first two 800 and 1000 sucks the 1200 it goes over my screen 1400 is really really blurry and the 1600x1000 doesn't fit
Try changing your screen resolution to one, and then using that resolution in CrossFire, like Hero's method.
Try tweaking your graphic settings, on Crossfire and your monitor too. Check for any updates to your Video Card too, it can help you as well.
If does not work, try using different resolution.