Video 1. How AMD went from nearly Bankrupt to Booming by Brandon Yen (2021) Source.
They have been masters of second sourcing things for a long time! One can ony imagine the complexity of the Intel cross licensing deals.
This was the CPU architecure that saved AMD in the 2010's, see also: Video "How AMD went from nearly Bankrupt to Booming by Brandon Yen (2021)"
Video 1. AMD Founder Jerry Sanders Interview (2002) Source. Source: exhibits.stanford.edu/silicongenesis/catalog/hr396zc0393. Fun to watch.