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SlashGear

Key differences between Thunderbolt 4 and USB4 that affect performance, compatibility, and device support

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Thunderbolt 4 guarantees reliable 40 Gbps speeds across its certified cables, even those up to 2 meters in length.

USB4 devices can operate with a lower minimum speed of 20 Gbps .

Thunderbolt 4 requires double the minimum power delivery of USB4 , with 15W compared to USB4 's 7.5W.