The only disadvantage of display port that I can think of is that it’s harder to find capture devices (or at least Linux compatible ones) that have display port. Generally no one cares about that stuff though. I use capture cards because I sometimes do stuff involving other computers and it’s 1000 times more convenient to have a vlc window floating around with the display output.
No one seems to have this use case besides me, I’m just glad that there exist capture cards fast enough to do playback in real-time and not a 5 second delay. I don’t stream.
DisplayPort is designed to give your GPU a fast connection to your display. HDMI is designed to give the copyright holder of the video you are watching a DRM protected connection to your display to make piracy harder.
This is why DisplayPort is better for the consumer but HDMI is more popular because the device manufacturers are really in charge of what you get.
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