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iM 4,1-14,4 2011 iMac Graphics Card Upgrade

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The first post of this thread is a WikiPost and can be edited by anyone with the appropiate permissions. Your edits will be public.
rukuku said:
Ladies and gentlemen, I need your expertise:
iMac 12,2 mid-2011 27" was upgraded to Sequoia with OpenCore.
After that, the owner encountered issues related to the GPU, and so an AMD WX1450 was installed. Allegedly the GPU came pre-flashed with an appropriate BIOS. The machine starts and works, but it fails to recognize the GPU and display and it's extremely slow.

System report for the GPU lists it as an AMD with no kext installed, and only reports 14Mb VRAM.

The owner tried using the USB Stick BIOS flash, but nvflash does not detect the GPU either. However, when OpenCore runs a post-install root patch, it reads the GPU as AMD Polaris and offers to install patches for that card.

What should be done?
Click to expand...
I fixed it!

1. The fact that OpenCore saw the GPU meant that everything was fine with the GPU's BIOS and the card was reporting correctly.
2. With that in mind, the issue was related to the OpenCore settings so I re-installed Sequoia with a correct set of patcher settings. Most importantly:
  • SMBIOS: MacPro6,1.
  • GPU Support: Enable Metal acceleration for AMD Polaris; also AMD injection enabled
3. After re-install, the OS recognized the GPU correctly, everything seems to be functioning well.
 
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