As above? What would be the minimum, would 2x 970s do it?
Although I am tired of SLI when it comes to H1Z1. Would a single card be capable? I dont play much anymore.
Mostly -
Killing Floor 2
H1Z1
Rocket League.
What 4K monitor? With Gsync/Freesync or not?
It all depends, because with Gsync/Freesync if you manage to pull constant FPS above the minimum required for the tech to work, it works wonders.
I can tell you that games that support 1 GPU and run on 1 core like WOT at 2560x1440 with everything maxed out, runs at 75+ fps, which is within the range of the XL2730Z Freesync (40-144) and feels superb like eg Crysis 3 running at 120fps maxed out on CF.
On a non *sync monitor 75fps looks crap though. Same applied to games that run at 50fps. With Freesync runs, without looking crap. (I know since I have to use the old XL2410T atm).
4K is 4x the 1080p pixel count, 2.5x the 2560x1440 and 1.674x the 3440x1440. Thats a lot of pixels.
Consider this chart (which also presents that there is a limit on GPUs and not CPUs at, look the A10!!!!!)
http://hexus.net/tech/reviews/cpu/85370-intel-core-i5-6600k-14nm-skylake/?page=8
Double the numbers with the next generation for those games. However as newer games come out, more demanding, half the numbers, and comes back to square one.
You either keep away from 4K, or you make consentions not using everything maxed out and AA off.
3440x1440 Curved gsync/freesync (possibly HDR if we manage to get it this year) are the thing we should be targeting for at least another gen. Except AMD/NV can pull off a miracle for 4K gaming.