Mojave install with unsupported AMD video card?

[punk4evr]

Hello... just wondering if any one knows of a working solution to installing/updating to Mojave or Catalina on a 2012 mid Mac Pro? I have 12 gig ram, 4 hard drives ( with only os on them) 3.3gig 6 core paired cpu's, its running the B00 Rom version with high sierra currently. I went a got a amd rx 5600x video card i want to use on it. I see in catalina is supporting the 5700xt, so... So far every time i have tried to either upgrade it does not see the Metal video card; and from what i read, i need the later os to support Nvme ssd, and the graphics card. But i can't install cuz of the graphic card. So it's just stupid at this point. It wan'ts better but won't load support for it. So i'm at a loss.

Thank You.

 

[MarkC426]

In order to use 5700 you need Catalina.
For Catalina you need to ‘hack’ your Mac with OpenCore.
cMp only supports up to Mojave officially, with a Metal Gpu.
You cannot upgrade to Mojave without a metal gpu.

Go to Mac Pro section for all your answers.
There are numerous threads discussing this.

 

[punk4evr]

Thank You! Being new to here, did not know where the thread was. I was sure there would be one, but didn't see it at the time. And yes, i'm trying to find a low level Radeon video card for the mac pro. But if I can get it to boot into Mac OS with the 5600xt I would be very happy. Thank you again.

 

[MarkC426]

Maybe start here:

OpenCore on the Mac Pro

This guide explains how to use the excellent OpenCore boot loader to install, run, and update the latest version of macOS on the MacPro5,1, resulting in a clean, unaltered operating system just like on a supported Mac.

forums.macrumors.com

but be aware there is loads of fiddling to do, under the hood.