https://wccftech.com/ps5-hdmi-2-1-bandwidth-is-limited-to-32gb-s-unlike-xbox-series-xs-40gb-s/

After the confusion on whether a PS5 HDMI 2.1 cable was included in Sony's next-gen console's box (it is, as clarified a while ago by GamePro), HDTVTest guru Vincent Teoh has now opened the proverbial Pandora's box on another possible PS5 HDMI 2.1 shortcoming: its bandwidth.

According to his tests with the LG 48" CX TV, while the Xbox Series X can output bandwidth of up to 40GB/s via HDMI 2.1, the PlayStation 5 is currently limited to 32GB/s. In practice, this means that when playing a game at 120 Hz, the console will have to switch to 4:2:2 chroma subsampling, while Microsoft's next-gen console is able to keep the optimal 4:4:4 format.