A:Answer This TV doesn't support 4K@120HZ resolution because it doesn't have HDMI 2.1. The HDMI port #3 is for eARC/ARC, it's the only port where you can enabled enhanced mode for gaming but you are still limited to 4K@60Hz. From Rtings: "The Sony A9S OLED can't take full advantage of the PS5 or Xbox Series S|X, as its HDMI ports lack the bandwidth necessary for 4k @ 120Hz gaming. The replacement model, the Sony A90K OLED, supports HDMI 2.1 bandwidth on two of its HDMI ports, and it has much better compatibility with both consoles."