Help, I need to run three displays on my Mac Pro 4,1.

Help, I need to run three displays on my Mac Pro 4,1.
I have a Radeon 5870 installed with OS X 10.8.3
need to run a Dell 30 inch dislay, a 19 inch Eizo and a 12 inch Cintiqu Display Tablet please.
Ant tipes or hints?  Failing that, I would like to know of a comptaible video/graphic card which will only take up an additional slot, as I have the others filled with eSata and USB 3 cards.
Cheers
David

Your 5x70s support three monitors. Are you having trouble?
Answered just last night in this thread also
https://discussions.apple.com/thread/4933924?tstart=0

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