R0bc's tip did the trick for me. I have both cards now running between 80 and 90% at the same time with Vsync off. With Vsync on I only get around 50% on both cards. Performance is not that much better then with one gtx680. Temps are 10-20 degrees c lower then single card so that's good. If you have two cards, use them but I would not run out and buy an extra gpu for this game alone. I'll do a bit more testing.
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