I almost feel like I should sell one of these 1070s - it feels almost like too much... I got the MSI Armor 8G OC x2 (SLI), and holy bajeezus. I was averaging 120 fps at 4k on the benchmark run on GTAV, with only a couple performance settings turned down (like AA) that don't really impact appearances very much. Was running about 45-50 fps on my lone 970 before. It's just beastly - I ran through Heaven and Firestrike Ultra for a while and never went over 75C on either card, and the clock was running at a minimum 1880 hz for the duration (1950 hz for a while at the beginning), while the cards were pretty much completely silent.
I don't even have the new SLI bridges, just an old ribbon bridge.