Hallo,
the R9 280X works fine with High Sierra 10.13, Mojave 10.14 and Catalina 10.15.
I use Lilu.kext and Whatevergreen.kext in the EFI. But R9 280X work also without the Whatevergreen.kext.
I use a Multi Monitor Setup 1Monitor on HDMI and 1Monitor on DP, works fine.
Greetings Mocca55
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