Well, are there any games that you're getting sli issues with that bothers you? May be a good reason to switch to a single, same-speed card.
First things first, you've gotta wait on the actual release, which is July 16th? We'll probably get a bunch of youtube videos on the card vs other cards, and im sure there will be some 2x970 vs fury vs fury x videos, so I would definitely look out for those.