Need a Computer Guru's Help

I just ordered a Cintiq and started looking at my Computer for the Setup. I already have a dual monitor setup so I was going to add another PCI express Card so I could run 3 monitors and the Cintiq for a quad setup but I am a little confused about the Motherboard specs/setup.

It says...
"2 x PCIe X 16 slot, supports two PCI-Express interface Graphics cards with SLI mode "

http://www.gigabyte-usa.com/Product...rd&ProductID=1898&ProductName=GA-8N-SLI Royal



I already have an ATI x700 in one of the slots can I just buy another x700 and run it in the second slot or do I have to buy the special SLI Video cards to run these in series.
I do have a normal PCI 256 meg Video card that I could just plug in to the standard PCI Slot but I am leary that may dog my system with a Bottleneck.
Any Help would Appriciated

 

Found it.. It was buried in the apendix of my Manual after looking at it 20 times.

In case you care SLI is Propritiery but it takes a Jumper to Join the 2 cards to activate the SLI otherwise it will work as 2 seperate cards so I can set up a Quad monitor system.