I am a bit aware of the problem; Crossfire will not be displayed in two different cards. As far as I know, Crossfire and eyefinite did not play well. I have 2x5850's (the same, the same clock, and same manufacturer), the crossfire is disabled. I can be extended to all three screens. All 24 "(1920x1200) display DVI. 2 are inserted into the 5850's first set of DVI ports; the other is inserted into the second DVI port 5850. I have tried this on 3 to 4 different monitor but I am unable to get Eyefinity to work.
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