Mystery connector

I found this in my box of cables, but I don't recognize it.
Anyone know what it is for? It's about the same size as an HDMI cable.

DisplayPort connector

Thnks. I don't know why I would have this cable since nothing here uses displayPort..

Came with a monitor or a beefy video card, most likely

You could have seen this picture a day ago:
afbeelding
It is taken from this test of DisplayPort cables:

(clears throat)
My work in progress (mostly complete) connector chart.
There is these few SFF connectors I need to "digitize" (and the IDEs too) and find the elusive old samsung connector, but otherwise (especially for USBs) is pretty complete.
It's more of a "walk down memory lane". There exist some "freaks" like the DVI-59 (which is basically two DVI connectors combined into one, almost exclusively used for old video card outputs), as well as the failed attempt to monopoly (apple display)
Oh. There was also the elusive "mini RJ45" that I need to find a sample of.
To be fair I prefer the old big fat cables with screws, because they will never come off, even with a good tugging. Compared to modern HDMI cables that will literally sag and bend the connector with their own weight.