Jim Keller apparently not only worked on Ryzen but also on an arm CPU named K12 [1] until 2015. It is likely that AMD still has the blueprint for that CPU stash

Jim Keller apparently not only worked on Ryzen but also on an arm CPU named K12 [1] until 2015. It is likely that AMD still has the blueprint for that CPU stashed away to focus on the x86 market but still have a plan b if arm becomes dominant. [1] https://en.wikipedia.org/wiki/AMD_K12 https://en.wikipedia.org/wiki/AMD_K12