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#21
I believe smarteye's experience is personal. I will add that though I haven't had the personal experience myself I have read lots of stories and issues concerning ATI crossfire solution. In fact I've said it plenty of times that crossfire is broken and I myself would never get into it till fixed (maybe).
Anyway you can check sites like rage3d - CATALYST Drivers - Rage3D Discussion Area.
I've never had an Nvidia card but I've read they have/had issues as well.
It's basically trying to get two GPU's to play together nicely.