M1 Mac Thunderbolt 4 ports mostly don't support 10Gb/s speed - 9to5Mac

Pro users of M1 Macs have reported disappointing transfer speeds with external SSDs, and tests appear to show that most M1 Mac Thunderbolt 4.

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Tests show Thunderbolt ports on M1 Macs don't fully support USB 3.1 Gen 2 speeds: Digital Photography Review

Tests show Thunderbolt ports on M1 Macs don't fully support USB 3.1 Gen 2 speeds: Digital Photography Review

New M1 Macs Have A Thunderbolt Port Issue!

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Apricorn

Tests show Thunderbolt ports on M1 Macs don't fully support USB 3.1 Gen 2 speeds: Digital Photography Review

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Thunderbolt 3 vs Thunderbolt 4 and the M1 Max and M1 Pro Macs