How to tell if a USB-C cable is Thunderbolt
Check markings, connection information and cable identity together to understand a USB-C cable, without mistaking missing data for a faulty cable.
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WhatCable Field Notes
What the connector doesn't tell you.
Practical guides, protocol deep dives and findings from real Apple hardware. Understand your cable, follow the connection and find a useful next step.
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WhatCable doesn't just take the cable's word for it
WhatCable compares available reports from the port, cable, charger, device and display link to help explain the connection you actually have.
Thunderbolt vs USB-C: what the connector hides
USB-C describes the plug. Thunderbolt describes a connection standard. Learn how speed, charging, displays and cable construction fit together.
From the archive
See what your own connection is doing.
WhatCable reads the port, cable, charger and connected device, then explains the result in plain English.