Have a extra SX Lite so decided to sand the SxT branding blacktop off of the main chip, looks to be a GD32F350CBT6, lets see where we can get :evil: https://www.gigadevice.com/microcontroller/gd32f350cbt6/
Not sure if you are docked or charging, but you need to be to get the gpu clock over 460. just tested this myself. i cant post links but if you visit the projects github it gives a overview of this information.