This is somewhat true of all modern cables and ports. They are all overloaded to some degree. It's hard to tell just by looking what resolutions and refresh rat

This is somewhat true of all modern cables and ports. They are all overloaded to some degree. It's hard to tell just by looking what resolutions and refresh rates a DisplayPort or HDMI device can handle on both the display and output side. For example my monitor will do 144Hz with FreeSync on over DisplayPort and can do 144Hz over HDMI but not with FreeSync on, then it's capped to 100Hz. Not even the manual lists that. Hard to tell what a GPU supports without memorizing model info. We have USB 3 ports where some can do 10Gb/s, most do 5 (My mobo has 1 10Gb/s A port) that are hard to distinguish if at all, some computers don't even bother color coding USB 3 ports either.