Other way around. AMD's early efforts were hard broken and needed a new CPU, SGX has never been as far as I know. Even when not technically "broken" AMD SEV was

Other way around. AMD's early efforts were hard broken and needed a new CPU, SGX has never been as far as I know. Even when not technically "broken" AMD SEV was broken by design because it didn't protect all the necessary state. SGX was correctly designed from day one and was always patchable via their TCB recovery process = software upgrade, sufficiently well that it could be patched to recover from Spectre attacks despite nobody knowing about them at the time SGX was designed. But that was just an example. Intel have introduced a quite a few interesting CPU extensions and special bits of hardware that AMD had no answer for over the years.