The AMD PSP 20 Device refers to the AMD Platform Security Processor (PSP), which is a security chip integrated into AMD-based processors. The PSP is used to manage various security tasks and features on AMD systems, such as secure boot, encryption, secure storage, and other hardware-based security functions. The "20" in "PSP 20" likely refers to a specific version or generation of the PSP technology, which could be related to newer AMD processors (like Ryzen 3000-series and later).