If I switch my the external monitor to 85 Hz, it goes really weird.
What does it need to support an lg uhd with 85 Hz?
MacBook Pro 2019 i7 16 GB & lg gk950-b
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I prefer to drop an external GPU on any Mac where the integrated one doesn’t meet my needs for refresh rate, connected displays or performance. Even a MacBook Air has Thunderbolt 3 speeds to extend performance greatly for storage, arbitrary PCI cards and more. You can upgrade Macs Mini and Air and Pro to add monster-sized 3D rendering cores with robustly connected fast storage through one cable if you choose thunderbolt daisy chain hardware.
Apple sells only a few eGPU direct to consumers and most are out of stock at present, but third party options are widely available and allow you to pick and choose your construction, support and features. Apple even calls out a few dozen models and AMD in particular as recommended models.
Since macOS Mojave 10.14 there is robust software support for preferring the external GPU even if the app you run might not yet check for this option.
The max refresh rate remains 60Hz.
Available refresh rates You can switch between these refresh rates on your Retina display: