Certified cables will carry labels assuring the consumer that they’ve been tested to meet the HDMI 2.0 spec.
One HDMI cable is as good as another, right? Wrong. The old saying “an HDMI cable will either work or it won’t, because digital is all or nothing” is a myth. A poor-quality HDMI cable can deliver a degraded signal, resulting in a snowy picture or worse. A crappy HDMI cable, especially a long one, can also cause problems that you can’t see: radiating enough electromagnetic interference (EMI) to cause problems on your Wi-Fi network.
Having said that, bad HDMI cables are pretty hard to find, at least when asked to carry 1080p video just a few feet. It can be a different story when you enter the realm of 60-frames-per-second 4K video with high dynamic range, high-resolution multi-channel audio, and perhaps even ethernet. According to the standard, an HDMI 2.0 cable should be capable of delivering “ultra-reliable performance at the full 18Gbps bandwidth.”
To that end, HDMI Licensing LLC—the group responsible for developing and maintaining the HDMI standard that’s used on nearly every TV, PC, monitor, projector, Blu-ray player, A/V receiver, and media streamer shipping today—has announced a new cable certification program. Instead of hoping for the best—or paying ridiculous prices for cables made by companies with marketing budgets that dwarf what they spend on manufacturing—you could just shop for HDMI cables labeled “HDMI Premium Certified Cable.”