X399+TR1 works great : you need to stay on a BIOS not compatible with TR2 and put PCIe 3.0 to PCIe 2.0.
One has to install general chipset dirvers from AMD+find drivers for audio and other stuff…

Has anyone tried Threadripper 3 and Windows 7 ?

Source: [H]ardOCP – Has anyone tried Threadripper 3 and Windows 7 ?