Monitor supports 144hz 1080p (120hz capped on hdmi, 144hz for dp)
I already use HDMI 120hz.
The GPU has 3 display ports and 1 HDMI port (It's the gigabyte gtx 1080 G1, link: https://www.gigabyte.com/Graphics-Card/GV-N1080G1-GAMING-8GD#kf), ports are 1.4, it is windforce
The cable does do 60hz 4k...