2K explained

The short explanation

Strictly, 2K is a cinema format around 2048 x 1080 — roughly Full HD, the step below DCI 4K. In consumer marketing it usually points at 1440p, or 2560 x 1440, which is the popular PC monitor resolution also called QHD.

Because the term is used both ways, it is safer to read the actual numbers on a specification sheet than to trust the label.

Where you run into it

1440p is genuinely useful on a big screen: it is a real step up from 1080p while costing far less bandwidth than 4K, which leaves headroom for a high refresh rate. 1440p120 is a common console and PC target.

The catch is support. Plenty of televisions accept 4K and 1080p but not 1440p, and the source can only offer it if the capability data lists it.

How the DR HDMI 8K handles it

The DR HDMI 8K passes 1440p50 and 1440p60 among the standard formats listed in its specifications, and its EDID controls let you check whether the mode is being advertised to the source at all. That distinction — not supported versus not advertised — is usually where a missing 1440p option turns out to live.