I had a lot of issues: obviously Ubuntu 17.04 doesn't boot, but Fedora 26 crashed a lot seemingly no matter what I changed. Windows 10 also crashed fairly often. I was about say that it wasn't as bad as F26, but given the automatic restart on crash that I kept seeing, it might have been as bad.

Currently using Arch/4.12-zen/nvidia with Gigabyte Gaming K5/Ryzen 7 1700X/GTX1060 and since kicking nouveau out, I have had no crashes at all. I am hopeful that this means my Ryzen woes are over.