Prior to launch, AMD had said they weren't supporting WIN 7, but that internally they had fully working WIN 7 chipset drivers.
Well, it looks like they've decided to release those drivers ... so it's pretty official now:
https://support.amd.com/en-us/download/ ... 0%20-%2064
Description:
Supports Windows 10/7 (32 & 64-bit)
Package Includes:
AMD Chipset Drivers
AMD Ryzen Balanced Power Plan
Support for AMD Ryzen Threadripper and AMD X399 Chipset
while you're here, check out these other two useful links if you're wanting to build a Windows 7 machine with the new AMD hardware:
Check here for how-to add AMD USB 3 drivers to WIN 7 installation media:
http://www.overclock.net/t/1624699/usin ... t_26201057
This stops Windows 7 Update from blocking support of the new AMD/INTEL cpus:
https://github.com/zeffy/wufuc
Disables the "Unsupported Hardware" message in Windows Update, and allows you to continue installing updates on Windows 7 and 8.1 systems with Intel Kaby Lake, AMD Ryzen, or other unsupported processors.
That should be everything you need to run Windows 7 nice & smooth on your new AMD.
Please report back if you've installed Windows 7 on a machine equipped with the new AMD cpus : )