I have a 30m HDMI run that I bought several cables that were certified for HDMI 2.0b but all of them were pretty unreliable at that length. After returning a bu

I have a 30m HDMI run that I bought several cables that were certified for HDMI 2.0b but all of them were pretty unreliable at that length. After returning a bunch I ended up buying a 50m (that's the shortest they had that would work) Optical HDMI cable and it's been smooth sailing since.