My mind instantly jumped to PhysX as well when Nvidia announced Ray Tracing.
So far it is a marketing gimmick with no tangible functionality. And what tests we've seen show that the 20 series is not capable of driving real time ray tracing to the extent advertised by Nvidia.
If ray tracing based games start to require more than 4C/8T CPUs, and AMD is likely to add ray tracing capabilities to their GPUs sometime soon, then that Ryzen 2600 deal for $160 starts to make even more sense. 4C/8T CPUs are on their way out for high-end gaming.
Not to long ago people were yelling 4c4t is more than enough.. where'd they all go? Crysis 3 took advantage of 8 threads in 2013... Don't buy the 4790k, the i5 is just as good... yup, $100 well spent considering it's doing just fine in 2018.
How was the Beta? Isnt ray tracing exclusive to dx12? Frostbyte doesnt really play well with dx12 from my experience.
DX12 was a stuttery mess in the beta, just like it is in BF1. It was almost unplayable for me, whereas DX11 was buttery smooth. If they don't fix that, then RTX will be pointless because of the CPU related stutter.