Nothing, PS5 caps out at 32Gbps, it can run 4K120 on the M28U because it's running 4:2:2 instead of 4:4:4. If im not mistaken, I read that Sony has released an update that allows the PS5 to output at 48 gbps bandwidth now though. You are mistaken. The PS5 still has a bandwidth cap of 32Gbps, which means even on a "full" 48Gbps input, it would
HDMI 2.1 ports on the Sony X900H are port 3 and port 4. These numbers should be aligned from left to right when horizontally placed and top to bottom when the alignment is designed vertically. Sony X900H will favor HDMI 2.1 through port No.3 and port No.4. The fact is that these ports feature an enhanced setting for various audio and video
The LG C1 OLED series of 4K TVs is fantastic for PS5 or Xbox Series X with features like G-Sync compatibility via FreeSync and game mode, HDMI 2.1 support, and a 120Hz refresh rate.
Soundbar: Samsung Q-70T (eARC) w/ wireless rear speakers and sub, 5.1 audio. Device: PS4/PS5. The problem: When audio settings on the consoels are on the default (PCM), the audio maxes out at 2.1 with no audio delay. On the other hand, if I select DTS or Dolby, the audio goes up to 5.1 with a slight audio delay.
You only need hdmi 1.4 for up to 1080@120, the cable that comes with the ps5 will be fine for that. Make sure the hdmi port on the monitor is at least hdmi 1.4 because a lot of cheaper ones use 1.2 since display port is more common for their use case. My monitor can handle 120hz through HDMI, it says in the manual.