Hi everyone,
I’m in the same boat as you guys and I was struggling with extremely hot MacBook Pro 16" (up to 70ºC/158ºF) with two external monitors connected. Today I’ve managed out how to fix that (at least for my setup) and wattage of the Radeon GPU dropped from 20W to 5W and tº from 65-70ºC/140-158ºF to 50ºC/120ºF just by setting the refresh rate of my 2xFullHD monitors to 55Hz (the default one was 60Hz). I’ve used SwitchResX for that.
Power consumption:
Settings for SwitchResX:
Steps are simple: create a new custom resolution for each monitor and set two parameters: GFT and Vertical scan rate to 55 (your value could depend on what your monitor is supporting). Save and reboot.
For some reason, the app is complaining that settings were not applied though they are.
I can be wrong but I guess it’s sort of a bug in drivers caused by some standard refresh rates which leads to extensive power-draining by discreet GPU.
Hope this will help you.
PS: photo of my setup with a description will be in the next post as far as new members can’t put more than 2 images per post.