I haven't figured it out yet, it might be the second temperature sensor ( "on-die" ).
It may be not.

FWIW somebody with some knowledge on programming can write an app to give us control of the Vgpu, OCP, OVP, OTP and possibly eliminate the cold bug ( I'm 1000000% sure it can be eliminated with a BIOS ) with a few lines of code ( wish my coding skills were up to the task, but I only remember how to write "Hello world" in C nowadays )