AKcrab is right. You are overstressing your video cards memory. I have an almost identical set-up. Same CPU with same memory with same Cinema Display at millions. However I'm running my 2nd display (1280x1024 at millions) on the built-in video card and perf is pretty good. I don't have a third display.
Probably -- if you put your Cinema Display and one other display on the same card you'd be okay, and let your non-factory card handle a single display.
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