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A comment on Newest MacBook Pro is the first MacBook not recommended by Consumer Reports. Parent comment
The two right-hand ports deliver Thunderbolt 3 functionality, but have reduced PCI Express bandwidth [1]
I can't find any official document which clearly states the speed of the reduced-functionality ports, but Apple also state this:
All late-2016 MacBook Pro models deliver USB 3.1 Gen 2 (10 Gbps) performance on all Thunderbolt 3 ports [1]
[1] https://support.apple.com/en-us/HT207256
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I can't find any official document which clearly states the speed of the reduced-functionality ports, but Apple also state this:
So there may be a 4x speed differential, depending which port you plug into.[1] https://support.apple.com/en-us/HT207256