Anecdote: At work, I have a Samsung 27″ 4k monitor and a MacBook Pro. I found that USB-C works best. I tried another type of cable and the picture looked like c

Anecdote: At work, I have a Samsung 27″ 4k monitor and a MacBook Pro. I found that USB-C works best. I tried another type of cable and the picture looked like crap until I switched back to USB-C. Both the computer and the monitor need to be connected to power directly, via their own power cables. I don’t use any hub/dock.