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AMD has ARM licenses (IIRC, both architectural and for IP cores) and has shipped an Arm Cortex-A52 SoC in the past (Opteron A1100). If Nintendo really wanted, they might be able to order an Arm SoC from AMD directly. But yeah, going with Samsung would be far more practical.

Problem is, many existing Switch games use some nvidia-specific API (IIRC called "NVN" or whatever) instead of Vulkan.