I ran SLI for 5 years, and spent more time with it off than on. It's just that you never know, some games might use it after a driver update, and other games will actually lag and shader flicker because it's on. Pretty much every new game has NEVER worked right with SLI right during release. Even Nvidia's new Ansel screenshot tool does not support their own SLI. Right now I just use a single Titan X Pascal. Yes it costs as much as two 1080s, but almost gives you the power of two of them (if you oc) +50% more vram, without SLI headache and epic heat