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I'm on a late 2019 MacBook Pro with an external monitor that has:

        B326HK:
          Resolution: 3840 x 2160 (2160p/4K UHD 1 - Ultra High Definition)
          UI Looks like: 1920 x 1080 @ 30.00Hz
In iStats, Radeon High Side shows 5.6-6W of power usage. But still, my CPU cannot sustain CPU frequency above 2Ghz for more than 5 minutes due to thermal throttling.


Why only 30 Hz? I hear 60 Hz solves a different class of issues.


My mistake, thanks for pointing that out. I have an old 2013 MBP (on which I'm typing this) which only does 30Hz. On 2019 MBP with DP I am getting 60Hz but the problem remains.




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