https://wccftech.com/lenovo-vendor-locking-ryzen-based-systems-through-amd-platform-secure-boot-in-the-client-pc-segment/

Serve The Home recently revealed that Lenovo uses AMD Platform Secure Boot, also known as AMD PSB, for their desktop platforms, especially the AMD Ryzen PRO-based systems to vendor lock the processor to their brand lines. The website has run a few features on the vendor locking process, and a recent video from the site on YouTube explains the purpose of AMD PSB and the advantages and disadvantages of the process.

In Serve The Home's recent video, they display a Lenovo ThinkPad desktop computer system, the Lenovo M75q Tiny Gen2, equipped with the processor onboard. The processor shows to be vendor locked to Lenovo systems specifically. Still, upon looking at the processor, the user would not distinguish it from an identical processor located on a separate system. The process uses AMD's Platform Secure Boot, and in the video below, the hardware site explains in detail why Lenovo would lock the processor to their systems and not others.