So those generation numbers aren't really anchored to Apple's hardware designs. It's just counting from when Apple introduced the Metal API, and the first several generations were when the GPU cores Apple was using were still nominally PowerVR designs.
yeah the naming is confusing. Apple family 9 isnt M9, it's a Metal GPU feature family. Apple maps family 7 to M1, family 8 to M2, family 9 to M3/M4, and family 10 to M5
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https://developer.apple.com/documentation/metal/mtlgpufamily
So those generation numbers aren't really anchored to Apple's hardware designs. It's just counting from when Apple introduced the Metal API, and the first several generations were when the GPU cores Apple was using were still nominally PowerVR designs.
yeah the naming is confusing. Apple family 9 isnt M9, it's a Metal GPU feature family. Apple maps family 7 to M1, family 8 to M2, family 9 to M3/M4, and family 10 to M5