Want to run two 30" cinema displays from Mac Pro

I'm running Avid Media Composer software to edit a film that I made, and I would like to run (if possible) two Apple 30" cinema displays next to each other off of my Mac Pro (the computer was purchased at end of 2009). While editing with Avid software, I like to spread out my work and bins in able to see everything, and strange as it may sound, I'd like more room than one 30" display can provide. Currently, I have one Apple 30" Cinema display in use, and could purchase another large display if I can find out-- definitively, if my Mac Pro computer will be able to handle it and power it effectively. I realize that Apple doesn't sell the 30" displays anymore, but I saw a few relatively inexpensive ones available on Craigslist recently.
The second monitor that I'm using now is a much older (non-Mac) monitor (and smaller) and the resolutions don't match the high resolution of my single Apple 30" display. So, my reason for wanting a second, larger display are twofold... 1) to see more of my work, and 2) to get the highest resolutions to match (2560x).
The ports on the back of the Mac Pro don't look like they will support the use of a second 30" display, just one. Does anyone have any suggestions?
Do I need to purchase another video card to run a second 30" Apple display? If so, which ones are best/do you suggest?
Do I need to upgrade my processing speed (get a faster processor) to run two large, high-rez monitors?
specs:
Mac Pro
10.6.6
Processor: 2 x 2.8 GHz
Memory: 2 GB
800 MHz DDRZ FB-DIMM
Quad-Core Intel Xem
Purchased end of 2009

If it has two DVI ports, just plug in the second display with an additional Dual-Link DVI cable -- the card can run both displays without issue.
If it has one DVI and one other type, Exactly which display card do you have installed?

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