Can you really do a true benchmark against each of them when the Nvidia card doesn't have access to that CPU?
Great question. I am assuming 2 things:
1. the games are running at 4K ultra so they are likely mostly GPU-bound.
2. AMD is using average FPS and not 99 or 95 percentile. So real CPU benefit is significantly under-represented in the number.
Adding up both of those factors, I'm comfortable coming up with a best-case scenario for AMD.
Of course, reality will likely not be as rosy. I am sure AMD cherry-picked those games. I am not pre-ordering a big navi yet, I tell you that.