What is the difference between USB4 40 Gbps and 80 Gbps?

Different generations of the USB4 spec, different cable builds, different certification — not a firmware switch.

Answer: 40 Gbps is the original USB4 rate; 80 Gbps comes from the later USB4 version and needs both ends and the cable to support it.

The cable must be built and certified for the higher rate — a 40 Gbps cable does not become 80 Gbps.
Both endpoints must support the higher rate; the link always equalises to the slowest party.
Ask for the certified rate of the specific model, not the family name.

Frequently asked questions

Is USB4 80 Gbps different from 40 Gbps?

Yes — a later USB4 generation with its own cable build and certification; both endpoints and the cable must support it.

About the author

Tonetron Engineering Team· Dongguan Taitron Electronic Limited

Tonetron is the export brand of Dongguan Taitron Electronic Limited, a cable and connectivity manufacturer in Dongguan, Guangdong, China. Our engineering and QA teams write these guides from our own production and test experience — including HDMI Forum ATC confirmations (certificates 5QSIMQP4DLG, 2JCHSF3SL1X, MG3CQ3Z4BAG) and USB-IF USB4 certification testing passed under TID 6801. Our USB-IF membership has since lapsed, so that entry is no longer in the public USB-IF product search; the certificate itself is published on our credentials page. The credential you can verify yourself right now: we have been a licensed HDMI™ Adopter since June 2005 — searchable under “Dongguan Taitron” in the official HDMI™ Adopter directory.

What is the difference between USB4 40 Gbps and 80 Gbps?

Related questions

Frequently asked questions

Is USB4 80 Gbps different from 40 Gbps?

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