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Seems there are two variants of the M1 chip in the MacBook Air, one with 7 GPU cores and one with 8. Wonder why that is the case.

Probably to get better yield. If one of the GPU cores has a defect, they can still use the die. https://en.wikipedia.org/wiki/Product_binning#Semiconductor_...

Maybe they only manufacture the 8-core version and bin the ones that have defects?