請參考原廠驅動說明
在WIN7應該是沒有支援到3rd Gen AMD Ryzen

AMD Chipset Drivers
https://www.amd.com/zh-hant/support...socket-am4/b450
Release Date
2019年11月25日

Supports:
Windows® 7/10 for
2nd Gen AMD Ryzen™ Desktop Processor
7th-Gen AMD A-Series Processors
AMD Ryzen™ Desktop Processor
AMD X470 Chipset
AMD X370 Chipset
AMD B450 Chipset
AMD B350 Chipset
AMD A320 Chipset
Windows® 10 only for
3rd Gen AMD Ryzen™ Threadripper™ Processors
3rd Gen AMD Ryzen™ Desktop Processor
2nd Gen AMD Ryzen™ Threadripper™ Processor
AMD Ryzen™ Threadripper™ Processor
AMD Ryzen™ Desktop Processor with Radeon™ Vega Graphics
AMD Ryzen™ Mobile Processor with Radeon™ Vega Graphics
AMD X399 Chipset
AMD X570 Chipset
AMD TRX40 Chipset

Package Includes:
AMD Chipset Drivers
AMD Ryzen™ Power Plans (required for UEFI CPPC2 in Windows® 10 May 2019 Update)