on R5, depends on the GPU it seems, if you are using a NVIDIA GPUit sucks comparing to intel (NV drivers are probably not optimized for AMD platforms), if you are using a pure AMD platform (Ryzen 5 paired with R9 or 480) is is as good as the intel platform.
anand's directx9 benchmarks:
http://www.anandtech.com/show/11244/the-amd-ryzen-5-1600x-vs-core-i5-review-twelve-threads-vs-four/14
PS: i dont know if NC is using builds with intel's TBB ( in that case intel might be ahead a few percent points)
and then is also the problem with physX, as it is meant to do do GPU acceleration on NV GPUs, so if you go AMD route, you will probably also loose a few % of the rysen core usage for the physics simulations