Hmm that is interesting. Can you elaborate what is exactly different between them?

I'm asking because I think a firmware has to directly talk to hardware through lower HAL (hardware abstraction layer), while customer facing parts should be fairly isolated in the upper HAL. Some companies like to add direct HW acces to customer interface via more complex functions (often a recipe made out of lower HAL functions), which I always disliked. I prefer to isolate lower level functions and memory space from the user.

In any case, both Nvidia and AMD should have very similar FW capabilities. I don't know what I'm missing here.