MACPRO 5,1 + AsRock RX 6600 - no signal after OC boot completes

[rob_jay]

Hi all,

Just wondering if anyone has successfully got the Mac Pro 5,1 to boot in macOS Sequoia with a AsRock RX6600 using Open Core?

ATM I am running Xeon X5690, 3.45 GHz, 12 Cores, 128 GB RAM.

I am running an AsRock Radeon RX6600 with the Syncretics Patcher.
I patched 2 cards on a Windows box and they now run in my 5,1 (without the native grey boot screen), enabling macOS Monterey, Windows 11, Ubuntu etc.
I run the latest OpenCore on both boxes.

However, atm I'm trying macOS Sequoia, I see the open core booter, then the system loses it's signal after continuing to login.

I also have a 3rd system, which uses a GTX 770 that was patched by the Mac Vids Euro team years ago and macOS Sequoia logs in and works fine.
So I am now testing with the OS from the working system and dropping the SSD into the system with the RX6600, but still I get the same issue.

I have tried a few things with the https://github.com/ChefKissInc/NootRX, but no luck. However, I don’t know exactly what to do with the supposed conflicts with Whatevrgreen Kexts.

I have uploaded the video I took a few hours ago. If this is unclear, I will re-film it more carefully. https://vimeo.com/1104870588?fl=pl&fe=sh
I will also try and attach a zip of the EFI.

Is there any advice anyone can provide?

Thanks,
Rob (Australia)

 

[Shaneee]

Was the EFI generated by OCLP for your MacPro5,1? Nevermind I see that it was. Here's your EFI updated with NootRX instead of Whatevergreen.

 

[rob_jay]

Wow thanks, I will try it now...

 

[rob_jay]

No luck... same scenario...

 

[Shaneee]

Remove the verbose ( -v ) boot arg. Found this quote from MaLd0n on InsanelyMac.

Some cards you need to remove -v to avoid black screen after boot(with NootRX or WhateverGreen). AsRock GPU its a good example.

 

[rob_jay]

Yes, I've seen that post before and tried it too, no luck.

Next I'm going to take a few steps back and see if Ventura works first...

I'll update soon!

 

[rob_jay]

No luck with Ventura either... I had someone feedback that it's the AMD Video Driver that needs the AVX instruction, which the Nvidia doesn't need...

This is probably why the 770 works, while the 6600 doesn't... which is somewhat ridiculous IMO!

I've tried this fix a few times now over the last year and I might need to give up soon if no one else has a MAC PRO 5,1 working with an RX 6600...