IF YOU GOT A NEW MONITOR:
High-resolution, high-refresh monitors require more bandwidth than your old one. This requires better, newer cables for reliable delivery in many situations. Even if they look the same.

USE THE CABLE THAT CAME IN THE BOX.
IF YOU GOT A NEW MONITOR:
144Hz is NOT turned on by default in Windows/your drivers. Nor is G-Sync/FreeSync.

Follow the directions for your monitor and video card. Many people buy these monitors and think it's just automatic.
IF YOU GOT A NEW MONITOR:
Older video cards may need firmware updates to fully support newer DisplayPort revisions. Normally this is hardware only, but some cards shipped with newer modes turned off until they could be validated.

These are not the same as driver updates.
It may have been a joke in the past, but I actually read the manuals for audio/visual equipment now.

DisplayPort/HDMI are some of the fastest interconnect technologies on earth. The bandwidth and feature set has exploded. There's so many nuances in how this stuff works.
Chroma subsampling to reduce bitrate over the wire as you scale other features is a pretty insidious effect as well.

The entire ecosystem is trash and Windows does nothing to help people. https://twitter.com/tuba_man/status/1342526651440099328
So many monitors so many cables so many adapters, so many moves, under the desk, on the desk, tuning resolutions, 10 years I'm not going back https://twitter.com/SwiftOnSecurity/status/849387222835089408
Wirecutter's senior A/V equipment specialist agrees you're alone in a boat in the ocean https://twitter.com/chrisheinonen/status/1342576370451247105
đź‘€ https://twitter.com/kuschku/status/1342575822864060419
You can follow @SwiftOnSecurity.
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