Wow! Is that one virtual desktop? What vid card(s)?
Yes, one desktop, using two 1Gig nVidia GTX285 graphics cards, driving two 2560x1600 monitors apiece.
The cards are showing their age. Newer ones would drive it as fast or faster, and use less power.
There are picture in picture windows in the left and right monitors, coming from an iPad 2 and a PlayStation 3, respectively.