Windows 10 Pro Insider Preview 1703 running on a Ryzen 7 1700 system, Asus Prime B350-Plus Bios 0513, 32GB DDR4-2400 Fortis Series, Samsung 960 Pro 512GB M.2 SSD, Intel i340-T4 Network Server Adapter, Thermaltake 600 Watt Power Supply.
So far the Ryzen build using the 1700 has been amazing, no major issues so far with any components. Asus seems to be on top of the BIOS releases as well. Microsoft, I hope is working on OS optimizations for the Ryzen architecture. I was exploring the new Windows build 1703 and decided to see the UI for Windows Defender, I ran a quick scan and checked the task manager CPU usage per core, I was surprised to see that it ran on a single core. Pretty good for isolating it to practically one core.