Other breh was saying you’ll need a monitor with an hdmi 2.1 input to display 4K 120 because hdmi 2.0 maxes out at 4K 60. In reality though the ps5 isn’t powerful enough to push out 4K 120, whenever you enable performances mode on these games, most of them are down-resing the games to 1080p in order to hit 120 FPS. Basically, as long as your monitor is 120hz you should be able to get the most out of performance mode on your games. If/when you play in highest quality mode then they will take advantage of the 4K and HDR capability of your monitor, which is why you want a 4K monitor with a high refresh rate.