In plain language
8K, sometimes written 4320p, holds roughly 33 million pixels per frame against 4K's 8 million. At 60 frames per second with full colour and 10-bit depth, that is far more data than HDMI can carry uncompressed — which is why 8K modes always come with a qualifier.
You will see 8K60 4:2:0 10-bit, or 8K30 4:2:2 12-bit with DSC. Those are not marketing shorthand; they are the specific compromises that make the format fit inside 48Gbps.
Why it matters in your setup
Every device in the path has to agree on the same compromise. If your display advertises 8K60 4:2:0 but the chain only carries the capability data for 4K, the source will never offer 8K — and nothing will tell you why.
8K displays are also where the larger DisplayID capability blocks appear, which is precisely where older EDID handling in the middle of a chain quietly truncates what the display was trying to say.
What the DR HDMI 8K does with it
The DR HDMI 8K passes 1500MHz / 48Gbps and supports up to 8K60 4:2:0 10-bit and 8K30 4:2:2 12-bit with DSC. Its EDID library includes six dedicated 8K60 4:2:0 FRL-5 tables with different VRR, HDR and audio combinations, so you can present a known-good 8K capability set instead of hoping the chain assembles one.
Need the hardware?
Open the DR HDMI 8K product page on HDfury.uk.