I've yet to see any sort of research out of AMD on MCM mitigations for things like cache coherency and NUMA. Nvidia on the other hand has published papers as fa

I've yet to see any sort of research out of AMD on MCM mitigations for things like cache coherency and NUMA. Nvidia on the other hand has published papers as far back as 2017 on the subject. On top of that even the M1 Ultra has some rough scaling spots in certain workloads and Apple is by far ahead of everyone else on the chiplet curve (if you don't believe me, try testing lock-free atomic load/store latency across CCX's in Zen3). Also AMD claimed the MI250X is "multichip" but it presents itself as 2 GPUs to the OS and the interconnect is worse than NVLink.