Resolving Sapphire Pulse RX 580 '40% Hang'
If your Mac Pro hangs at 40% during the Sequoia boot with a Sapphire Pulse RX 580 (often mislabeled as RTX), the issue is likely the BIOS switch on the card.
The Solution:
- Gaming Mode Switch: Most Sapphire Pulse cards have a physical toggle switch. It must be in 'Gaming Mode' (flipped toward the back of the card) for macOS to initialize the drivers correctly.
- AMD GOP Injection: In OCLP settings, enable 'AMD GOP Injection' to help the card communicate with the OpenCore bootloader.
- NVRAM Reset: After flipping the switch, perform a triple NVRAM reset to clear the old graphics state from the Mac's memory.
- Root Patches: Once you reach the desktop, re-apply the Post-Install Root Patches to ensure full Metal acceleration.
Original Question: "RTX 580 issues with OCLP Sequoia on Mac Pro 5,1"
Just wanted to post about my experience here in case it helps anyone else.
I have a flashed 2009 Mac 4,1 -> Mac 5,1. I wanted to install OCLP on an NVME ssd. Before everything it was running Mojave on the NVME.
When installing Sequoia, I had originally installed with the old ATI 5770 graphics card to have the boot picker so I can select my USB OCLP flash drive.
The install was a success. HOWEVER. After install I wanted to swap the old 5770 for a Sapphire Pulse RTX 580. When doing this I read you are supposed to revert root patches, swap the cards, and then apply root patches so that the proper graphics card patches can be added.
My issue was sequoia would not boot with my RTX 580. It would show the boot progress bar, but then at ~40% the card fans would stop, and the boot would hang with no display on the monitor. I spent hours trying to figure this out.
The RTX worked just fine with Mojave, so I had no idea why it wasn’t working.
Then I found a switch on my RTX and upon researching I found this switch was gaming mode vs computing mode. It turns out mine was on computing mode. I changed it to gaming mode, and sequoia finally booted up. I was then able to apply root patches etc.
I spent countless hours, suffered through countless black screens, boot chimes, and NVRAM resets. I saw some people asking a similar question about the RTX hanging either on sequoia boot or install at 40% try Checking your switch. Gaming mode is when it’s flipped toward the back looking at it in installed view.
Oh and I also checked the “AMD GOP injection” when installing open core.
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