[HELP] Cant get 144Hz on BenQ XL2430T

I tried using HDMI and DVI but I can't get 144hz (I was able to get 120hz with 1024x768 resolution.) In monitor's own settings it says optimal resolution 1920x1080 120hz, current resolution 1920x1080 60hz. How can I use it with 1920x1080 120hz? I am not able to set 120hz from any settings (except with with 1024x768 resolution)