Looking at nVidia's website it seems that it should support dual-link monitor set-up. i.e the same thing is displayed on both screens.
PTP
That's not what he's asking, but sure, you can do that.
The Apple page on Mac Pro graphics tells that all the cards (and, in fact, all the cards since the January 2008 Mac Pro) support two monitors up to 2650x1600 each.
Be warned that there are many complaints about the mDP -> Dual-link DVI made by Apple. Not sure about other brands though.