Am using 670 SLI and it's working great for me! Again the only games I'm playing is Battlefield 3, Battlefield 4, Hardline BETA(when it was on), Planetside 2 & from time to time some Age of Empires II HD(I don't think it got an SLI profile no?). It works great for me and I haven't had a real issue. Of course there might be some games that it doesn't play well with but they'd have to be in the minority and other games doesn't even have SLI-support so that doesn't matter.