What bandwidth does an HDMI 2.1 cable need, and which certification tier proves it?

48 Gbps, proven by the Ultra High Speed HDMI Cable certification. 18 Gbps is the Premium High Speed tier.

Answer: 48 Gbps — the Ultra High Speed HDMI Cable certification tier. HDMI 2.0 is 18 Gbps and the corresponding tier is Premium High Speed HDMI Cable.

Bandwidth	Certification tier	Typical use
18 Gbps	Premium High Speed	4K60 4:4:4, HDMI 2.0
48 Gbps	Ultra High Speed	8K60 / 4K120, HDMI 2.1

The tier is not a marketing label: an uncertified cable can be built to the same written specification and still fail at 48 Gbps.

Frequently asked questions

What bandwidth does an HDMI 2.1 cable need?

48 Gbps, which is the Ultra High Speed HDMI Cable certification tier. HDMI 2.0 is 18 Gbps (Premium High Speed).

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 bandwidth does an HDMI 2.1 cable need, and which certification tier proves it?

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Frequently asked questions

What bandwidth does an HDMI 2.1 cable need?

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