EDIT: Yes, Ryzen 2700/2700X is newer, and improved, but it will bump the cost of your build... Now, you can probably get away with this instead, unless you really need those extra cores.
I don't know if you can extrapolate anything from my own 'results'
I have a GTX1080 on an R7 1700 and see ~40 frames, mid settings on 4K.
Yeah, 4k's gonna get ya. 1440p has the least compromises, so that's where I'm upgrading to. Might want to turn that down to 1440p when possible, as 4k is pretty difficult to run on any build.