Apple's MacBook Air (2019) features slightly slower SSD compared to last year's Air
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Fledging 256GB Turbo Feather M13 PCIe NVMe Gen 3.0x4 SSD Upgrade –DIY kit & OS included– compatible with Apple MacBook Air (2013-2015) & Pro (2013-2016), Mac Mini (2013) & Pro (2014), iMac (2013-2019) : Electronics
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2019 MacBook Air Has 35% Slower 1.3GB/s SSD Read Speed