i build a computer with threadripper 1920x with aorus X399 gaming 7 and MSI Armor 8G OC with Windows 7 it normally work fine , but i doing nothing or playing blu-ray video my computer will crash by D1 BSOD and i write a mail to microsoft their engineer told me it's AMD's graphic driver cause the BSOD did any works with threadripper with win7 without BSOD??
Windows 7 was not designed for the x399 platform. You should be running windows 10. Windows 10 has far better support for modern machines.
but AMD officially release the X399 platform 's win7 chipset driver and win 7 graphic card driver so I think it should be support