How do I tell a USB 2.0, USB 3.2 and USB4 cable apart?

Answer: you cannot tell them apart by the plug. Three checks work:

1. Printed spec — the jacket usually carries the rated speed; a cable with no markings is a risk.
2. Certification logo — USB-IF logos correspond to certified speed tiers.
3. E-Marker read-out — a tester reports the cable's declared speed and current; this is the only way to catch a cable whose print does not match its build.

For a sourcing decision, ask for the E-Marker contents in the test report, not just a photo of the logo.

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