A:Answer I'm not sure if this makes a difference, but the specs say the HDMI input on this monitor is 2.0. HDMI 2.1 supports 120Hz on capable TVs. HDMI 2.0 does not. So perhaps you need to find a way to convert from HDMI to DisplayPort to have a true 120 Hz experience. I am looking at the same issue with my Xbox Series X, and I haven't found a good answer yet. I did find a reddit post where someone had the same problem and upgraded to an HDMI 2.1 capable monitor.