Anything over 1m and the bandwidth could be reduced to 20Gbps unless the cables were “Active” including special signal boosters at each end, but this significantly increased the cost. “Passive” Thunderbolt 3 cables reduced in data-transfer rate as they got longer. Thunderbolt 4 cables include a small number 4 underneath the lightning bolt logo. Like Thunderbolt 3, Thunderbolt 4 ports and cables show the small lightning bolt logo, which helps to differentiate TB4 from USB4 and older USB-C 3.2 ports.
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