Black screen on sapphire nitro plus rx 580 8 GB high sierra and mojave

I'm constantly getting a black screen error when I'm trying to install Mac OS on my system. I have xeon x5675 and asus rampage 3 motherboard in my system. I'm connecting my monitor via Hdmi. I've tried almost all the commands and kexts. I still can't solve the problem.

submitted by /u/alppesen
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