https://wccftech.com/nintendo-switch-oled-dock-4k-output/

The Nintendo Switch OLED dock features a chip that is capable of outputting at 4K resolution.

Twitter user @KawlunDram recently opened up the new dock and discovered that the DP2HDMI chip is an RTD2172N KBDQH1 chip that is capable of outputting at 4K resolution.