I also am running Titans in SLI as well as running in Nvidia Surround (5760x1080).

The SLI support is terrible, In small areas things run great (100+ FPS) and the cards are at 80%+ utilized but in crowded areas things run slow (30-40FPS) and my cards are pegged at only 40-50% utilized. It seems like a client / server problem where the server can't send out the information tot he client fast enough in crowded areas so the client is stuck waiting on screen render.

Hopefully it will get looked at by SE.