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It’s the amount of RAM that matters. It’s supported on the M1 but not on the A14. Both have the same CPU core design and neural engine, including the same number of neural engine cores. The A14, however, has 4 or 6GB RAM while the M1 has at least 8GB.

As the models used can be quite large this probably means the A14 doesn’t have enough headroom for it give a good UX.

Lack of memory (2GB less) and lack of power in the ML unit (A17 Pro has double the power of the previous one) are the deciding factors.

Why not both?