ehh, im not crazy about it, but its a good thing. Can you run 4 monitors now? I'm buying 2 4870x2's soon so not extremely concerned about it at this moment.
I don't actually know if it's 2D only. I'll have to try dual screen mode in Supcom.
I think it works in 3D mode too, but the only thing is, you can only plug monitors into the master video card, not the secondary one. So two screens only