I've got an i5 7600k @ 4.8Ghz with a 1080ti and serving me fine. I also went GPU then monitor, definitely the way to go. I was on a cheap 1080p monitor for a while with it and you can literally run everything maxed and get 200+ FPS on most things which was fun. Now I'm on a 1440p 165hz and it's fantastic. I'm on a Z270 SLI plus mobo as well which is the same caliber as yours and it's fine, I've got everything on a decent oc as well.