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Yes, the Sapphire HD 7950 is a metal supported card. The point is that it isn't working in the macpro5,1 but does work in the macpro2,1. What can I do to get my system to recognise the Sapphire? Monterey is installed and boots fine. I ned some guidance, if anyone can help with how I might be...

I'm using a MacPro5,1 and have been running macOS Big Sur with an unflashed SAPPHIRE HD 7950 3G GPU - no boot screen but works fine after boot. In particular, the acceleration has worked well when using Logic Pro X (I used micropatcher automator to successfully upgrade from High Sierra to Big...

All resolved, thanks so much!

I've attempted twice today to do a clean install of Big Sur using the link you sent me, but unfortunately when it reboots mid-installation a white screen and a prohibited sign come up and I can't go any further with the installation. The second time, I got rid of everything and started again...

I don't understand your reply. Do you mean #5 is replaced with the link you provided? Or do you mean start the whole process of a clean install of Big Sur from scratch using this new link? Please can you clarify?

I've managed to successfully follow all the instructions until #5. I'm confused about what "working directory" is on my mac pro 5,1. And I'm struggling with the opencore bit of the process. I've downloaded the 3 kexts and copied them into the kexts folder in X64 (which I copied onto my desktop -...