I've had very few issues with SLI and i've been running it for years. the 970s that I have now are the third SLI setup I've had in a row. Also, the benefit of 2 cards is when the new ones come out, you can sell one card at a time; one before you get the new gpus, and one after. That way you still have a functional pc in the mean time. That's what I'm doing now for my upgrade to gtx 1080 SLI.