Here's a screenshot from hwinfo64 under prime95's max heat generation test. This thing sure does heat up, although part of the issue is that it's only under a CM Hyper 212X (which is performing admirably, all things considered).
Warning: Spoiler! (Click to show)
There's also this bit from AMD about temps which I found interesting: https://community.amd.com/community/gaming/blog/2017/03/13/amd-ryzen-community-update
Take your CPU temp and subtract 20C? I can live with that.