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@Savitar To fix the driver issue for Windows OS, use ATI patcher. See the download link in Posting 139 by Krutel.

@killgara Try the modified rom in the attachment and let me know if it works for you.

@quaczek666 I did some more search on the net. It looks that your video card is a Mannajue branded RX580 2048. I found its original rom and also a GPU-Z screenshot that match your card (in the attachment). You may try the attached rom and see if it works.

@myroslav I'm a bit puzzled about your request. I've not encountered a video card that came with two versions of rom from the manufacturer/vendor. Is your posted rom one of the two versions of the original rom that you received with the your video card from the manufacturer/vendor? If so, is...

@myroslav Can you post the original rom of your video card?

@vlabl That's a topic too broad to offer suggestions on the forum, without knowing the details of your hardware. There could be several reasons why a black screen appears when loading macOS (I'm assuming you see the black screen when trying to start macOS). I would suggest that you begin with...

@Lcoaps Try the modified rom in the attachment and let me know how it works.

@vlabl: To fix the driver issue for Windows OS, use ATI patcher. See the download link in Posting 139 by Krutel.

@vlabl That's new to me. Hope that it performs better than a 8GB RX580 1048SP card.

@ZachBacon Try the modified rom in the attachment and let me know how it works.

@Flipcq It sounds something is wrong with your OpenCore config.plist file. With the original rom, your RX580/2048SP video card should be able to display and boot into macOS with no issues. It will show only 7MB vRAM, as illustrated by my screen capture below. Have you tried to boot to macOS...

Remove the existing AMD driver in Windows 10/11 by using this AMD driver removal tool: https://www.amd.com/en/support/kb/faq/gpu-601, restart the computer in Windows 10/11, and then install the AMD driver for RX570/580 by using AMD's driver detect and install tool: https://www.amd.com/en/support.

@Flipcq Try the modified rom in the attachment and let me know if it works for you.

@ghostfire To fix the driver issue for Windows OS, use ATI patcher. See the download link in Posting 139 by Krutel.

@ChiefBsa Try the modified rom in the attachment and let me know if it works for you.

@ghostfire Try the modified rom in the attachment and let me know how it works for you.

@OReO Try the modified rom in the attachment and let me know how it works.

@art-artemon Your posted vbios (Ellismere.zip) doesn't appear to be your original video card rom. It had already been modified. Anyway, I did my best to edit it. Try the modified rom in the attachment and let me know if it works for you.

@ahmedvapors Try the modified rom in the attachment and let me if it works for you on both Windows and macOS.

@ahmedvapors: Your attached vbios (Stock.rom) doesn't appear to the the original RX580 2048sp rom. I couldn't find the card reference in your vbios file. I also tried your modified vbios file. It wasn't your orignal rom either. If you upload your original vbios, I'll give it try.