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it will likely require more than just one arm and a leg in cost
You could just split the signal and use two cables. If so you could even do 120 Hz with DVI on yesterdays graphic cards.
I think the OP wants 90hz @ 2560x1600 as it's roughly the maximum that Displayport 1.1 can provide.
WILL GIVE ARM AND LEG FOR THIS DISPLAY
Something tells me that trying to sync that up would incur some nasty input lag, or that it wouldn't quite work right.