Since 2013 AMD have it's own technology called "Platform Security Processor" (PSP) which is ARM TrustZone core running signed closed-source code. It's efficient

Since 2013 AMD have it's own technology called "Platform Security Processor" (PSP) which is ARM TrustZone core running signed closed-source code. It's efficiently have all the same access ME have. Of course any processor that have PSP support not going to work without PSP firmware.