Mojave Resolution Issue (Radeon R9)

Guys, any ideas why I only get 1280 resolution as the display option?

I have a 34" monitor running an R9 390 which I know might not quite be supported with Mojave.... I have my SMBIOS set to 5k iMac and the GUI set to a higher res. (but I think this is for clover boot menu only), I have also tried holding the options key in preferences, nothing else comes up. The system actually recognises my exact card as I have injectATI with fakeID. Ive tried a kexts and drivers like CSMvideo but nothing has worked so far.

Does anyone know of a workaround to get a larger resolution?

Many Thanks

submitted by /u/stb654
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