HDMI Group’s premium certification asks that cable manufacturers test their hardware at an authorized testing center. There, HDMI Group will make sure cables can stream a full 18 Gbps signal with a reduced electromagnetic interference (EMI) levels to eliminate unnecessary interference with your Wi-Fi signal.
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In addition to 4K, HDMI Group feels its premium certification will be good for HDR video streams as well.
Once the group is satisfied a cable meets its requirements, the manufacturer can slap the ‘HDMI Premium Certified Cable’ badge on the packaging. Huzzah!