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It's thought that the MBP score is due to it being ran possibly during indexing on setup. The score difference is too big, it's a single sample, and the pro still fries it at single core.

Based on a sample size of 1 or 2, most likely. It could be due to something as stupid as Spotlight running in the background on the MBP but not the Air.

The silicon lottery is still a thing.

I imagine they will eventually have enough chips to start binning for different performance levels like AMD and Intel do.

They are already binning. The air is supposed to be less powerful, with cheaper variants even having one core less.

The benchmark is just ... that accurate.

They are binning for functional GPU cores and allow chips with only 7 functional GPU cores instead of 8 to go into the lower priced Air.

They are not binning for how high the cores will clock, which is just how business is done with Intel and AMD.