M3 MacBook Air refresh boosts storage speeds for 256GB models
Briefly

Teardowns revealed that this was because Apple was using fewer physical flash memory chips to provide the same amount of storage.
BlackMagic Disk Speed Test performance increases accordingly; read and write speeds for the 256GB M2 Air come in at around 1,600 MB/s, while the M3 Air has read speeds of roughly 2,900 MB/s.
Read at Ars Technica
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