FWIW, most of the "known compatible" mobo's are all out of stock, just like the video cards. So you might as well try it. Other boards in the same MSI series work, so I don't see why this one won't.
Also, almost all decent boards should support up to 3 video cards, since they should all support nVidia's 3-way SLI.
But, I'm not a hardcore gamer, so I don't know for sure...
The regular one is in stock, so that's not an issue for me. It does support 2-way SLI according to the box, but still looking for someone who has used one of these...