Sorry, I just read your reply I guess DP 4 is newer than DP 1.4. I just went clueless again.
Dana
It does not support 4k through the DP port.
This is because HDR support for DisplayPort was only introduced in DisplayPort 1.4. HDR: Nvidia graphics cards.
Are you seeing this condition on a computer monitor or a TV monitor? TV monitor LEDs or LCDs are about 4 times bigger than a computer monitor pixel.
I don't know about a 4k TV monitor LED size, but computer monitor screens