This motherboard is on the X5000 XEON platform, and it has 2 x16 slots (tho I doubt they're true x16).
It doesn't have official SLI or XFIRE support. Do you need the motherboard support? I remember reading something about the X1950XT's having native x-fire or something.
You are about to answer a thread that has been inactive for more than 6 months. If you still wish to proceed, please ensure that your posting is original and does not duplicate or overlap any prior responses to this thread.