According to this, it supports 2 graphics card for additional displays but it doesn't support SLI..
Quote:
The second big surprise is the presence of the second PCIe x16 slot - remember this is an Ultra chipset that we are looking at today, not a SLI. DFI has something that they are touting called Dual Xpress Graphics (DXG), which simply allows the addition of a second video card for an additional two displays for desktop output. Unfortunately, the official line is that it will not support SLI as there is no SLI bridge piece included with the board. By default, the lane configuration is set to x16/x2 for x16 slots but the infamous pencil trick will change it to a x8/x8 configuration. There is talk that NVIDIA will be cracking down on modded Ultra chips so buying an Ultra board in hopes of modding it to a SLI board are hampered by what NVIDIA can do on the driver side and the ability of end users to get a hold of the SLI bridge piece.
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