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Tests show Thunderbolt ports on M1 Macs don't fully support USB 3.1 Gen 2 speeds: Digital Photography Review
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Two of four Thunderbolt 3 ports in new 13" MacBook Pro with Touch Bar have reduced speeds | AppleInsider
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All four Thunderbolt 3 ports in the 2018 13-inch MacBook Pro with Touch Bar work at full speed - NotebookCheck.net News
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