Guess this the correct thread for this.
I just purchased and installed:
XFX Radeon RX 570 DirectX 12 RX-570P8DFD6 8GB 256-Bit DDR5 PCI Express 3.0 CrossFireX Support Video Card
First the Clover boot menu is corrupted. I can just make out the icons on the boot loader screen. This is on my Z270X Hack, with i5-7600K CPU on ASUS ITX motherboard. I dual boot on this machine.
I just removed the NVIDIA GTX 950 that I've used on the system for a year, having given up hope of being able to upgrade to Mojave. I was on 10.13.6 at the very latest security update, having just fixed the NVIDIA driver on that update.
So it starts with a corrupted Clover splash screen. I booted to Windows 10 and installed AMD Radeon drivers. Seemed to work OK.
I just finished updating my GA-Z97X to use a Gigabyte Radeon 580 8GB card, that went smoothly or as expected.
Using that knowledge gained, I turned OFF the NVidia Injection in Clover on the Z270X machine, and attempted to boot, using this XFX RX 570 card.
Black screen.
I came back to this thread, re-read post #1 and added RedeonDeInit = true to config.plist. Rebooted - all using a USB boot stick so I can make these Clover config.plist changes on my GA_Z97X hack.
Still black screen.
I removed any all all NVidia references in the config.plist. I can't generate a debug dump on the Z270X as I can't get beyond the black screen. But I have attached the config.plist from the USB stick.
I think I'm in a case where the XFX Radeon RX 570 is incompatible.
Is that the case?