I had a high speed HDMI cable and upgraded my soundbar. Keep getting out of sync with videos even though they weren't that long. I went to my cable box and you really can't tell how much bandwidth a cable labeled "high speed" can offer. I decided to use these cables after reading the specs, not sure if they could handle the max; but they should at least have been able to handle my 4K with 7.1.2 audio running through my sync box. I'm happy to report that they're doing it flawlessly. I had no audio or video snippets and can really enjoy my screen time.