I'm debating adding a second GTX 1080, or upgrading to a 1080 Ti. I'm running all my wow windows in a single 4k monitor, so it would seem that SLI might be the way to go. I have to keep the quality down to get the frames up, so I definitely need to upgrade somewhere. Probably be easier to find a second 1080, the Ti are gonna be out of stock for a while.