i
Apparently (just learned this with some curious Googling) SAM is a generic feature of Linux since years and more recently Windows, that AMD can theoretically enable on any Zen2 CPU... https://www.reddit.com/r/Amd/comments/jk76u9/smart_access_memory_already_works_on_linux_and_is/
Many of these features that AMD and Nvidia are marketing seem to be versions of existing technology wrapped in new marketing speak.
Yep just like RTX is a rebrand just like Gsync is a rebrand - SAM is not unique, it's a rebrand of an existing technique that already exists in other systems. Which is why is not be surprised if Nvidia got it to work on their gpu too - AMD may try to lock SAM to make your buy a ZEN 3 CPU unit you actually don't need it