Displayport gets 4k60 on Windows, only 30hz on macOS

Hey everyone.

I had been using an HDMI cable with my new GPU and macOS/Windows and getting 4k 60hz. The only problem is that there was some kind of sync problem with the GPU and my monitor, so I ended up getting some flickering every once in a while.

I switched to a Displayport cable and I can get 4k60hz on Windows with no issues, but on macOS I can only get 4k30hz. I've tried SwitchResX with no success too.

Any ideas on what I could try next?

My setup: Z370 HD3, i7 8700, 16GB 3400mhz Viper DDR4, Sapphire Pulse RX5700XT

Opencore 0.59, MacOs Catalina.

submitted by /u/reasonablyminded
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