Question HDMI compatibility


Sep 12, 2014
Once and for all can someone explain this to me. In the past the cheapest hdmi is fine but now I am updating my TV and want to maximise its potential using 4K, HDR, etc, I am reading a lot of conflicting information.

Simply put I am buying a Samsung ru8000, I will be using it primarily for gaming via ps4 pro and pc. I have researched it has 4x hdmi 2.0 ports.
Some websites state that you need hdmi 2.0a port to support HDR (if that’s the case then I can’t benefit from any HDR content through the hdmi cable?). Also do I just have to make sure the packaging of said hdmi cables in the future state somewhere on it “4K ready” or something similar? Seeing as it’s never that easy finding out if a hdmi cable is actually high speed or not like half the websites state.
Or will ensuring my hdmi cable is “high speed” through it having that 4K sticker on its packaging be enough and I won’t have anything to worry about anything like the tv hdmi input port numbers etc?
You need at least an HDMI 2.0 cable to be able to transfer HDR content; HDR isn't supported on older versions of the spec. Any resolution/refresh higher then 4k/30 also requires at least a 2.0 cable due to bandwidth limitations.

The first link below references what resolutions/refresh rates each HDMI version can physically transport:

The second below link references what resolutions/refresh rates HDMI 2.0a/b can physically transport with HDR10 enabled content:

As for cables:

High Speed: HDMI 1.4 (supports up to 4k/30)
Premium High Speed: HDMI 2.0a/b
Ultra High Speed: HDMI 2.1
HDMI 2.0a and 2.0b are part of the HDMI 2.0 family. Manufacturers often don't bother labeling interim version numbers, so any of these may be labeled "HDMI 2.0".

HDR doesn't depend on the cable. You don't need an "HDMI 2.0a cable" to transfer HDR data. It doesn't matter what "version" HDR was introduced in, because cables don't discriminate based on the content of the data, only the rate of it. This is exactly why cables aren't classified by version number, to avoid this sort of misinformation.

High Speed HDMI cables are certified to work up to at least 10.2 Gbit/s (4K 30 Hz), although many will work at 4K 60 Hz.

Premium High Speed HDMI cables are certified to work at 18 Gbit/s (4K 60 Hz).

All other features, such as HDR support, don't depend on the cable.