My setup is a 2021 MBP 16" connected to a 3440x1440p monitor at 144Hz via DisplayPort.

RDM.app//System/Library/Displays/Contents/Resources/Overrides/ was the solution on Intel/AMD macs but it doesn't work on Apple Silicon.

BetterDummy is the only workaround I could find but it doesn't support any refresh rate other than 60Hz.and also looks rather blurry compared to "native" HiDPI.

I cannot disable SIP as this is a work-provided machine. I do have root privileges though.

  • Can't you set the resolution and scaling in System Preferences > Displays > Display Settings? There's a "Show All Resolutions" checkbox that offers more HiDPI options.
    – benwiggy
    Feb 2, 2022 at 12:00
  • No, there are only lower resolutions without HiDPI and those obviously look awful. As mentioned, I also used RDM.app which exposes all resolutions OSXII could use for the monitor.
    – Atemu
    Feb 2, 2022 at 20:40

1 Answer 1


The evolution of BetterDummy BetterDisplay is capable of modifying monitor properties without dummies at full resolution (spacial and temporal).

Unfortunately though, it is proprietary, closed-source and paid.

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