Honestly I think it's pointless.
Put it this way if your budget meant that you could build a rig with say a 1800x and 1080 or 1600x and 1080ti, you would notice far more difference with the 1600x and 1080ti, especially at 4k.
At 4k the graphics card has far more impact. Plenty of benchmarks show barely any difference between any of the processors at that resolution. It's only at 1080p where there's any real difference.
You mention thread ripper, so if you were considering a 1900x then it's even more pointless, it's pretty much a higher binned 1800x with a higher entry cost (quad channel ram, more expensive motherboard etc). You'd see zero tangible improvements in gaming.
I can go 1800x and 1080Ti. If that may get me another 12 months down the line. Currently on i7 920 and only jumped onto a 1070 last month from a 880gtx so you can see how often i upgrade..