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[Success] Radeon RX 6800 XT - Big Sur

Joined
Sep 23, 2021
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2
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Gigabyte B550 gaming x v2
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Ryzen 9 5900x
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Radeon RX 6800
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  1. Mac Pro
finally got it working. did took a long cut of downloading and installing the recovery of CATALINE 10.5.7 and then updating via beta profile. but its here, finally.

People should remember to leave their system do the work if they have not added the BOOT ARGS: "agdpmod=pikera" the installation happens on its own. when you don't see the mac Installation and only see mac as boot option in the open core menu, you know that its good to go. now you can either add the option and you will start getting the display as mentioned before.

The only issue I have is that I find the brigthness low even after 100 % at hardware level. what can the be issue here ?

View attachment 516228
Hello I had the same brightness problem. The problem was solved by simply changing the refresh rate of the display in the settings from 60 hertz to the maximum supported for my monitor of 170 hertz.

Thank you all for your work, without you guys I would not have solved this problem. For 5 days I tried to find a solution, but it turned out that the case was in the GPU.
 
Joined
Sep 3, 2018
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Asus Z690-A DDR5
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Core i5 12600K
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Radeon RX 6600 8GB
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  1. MacBook Pro
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AMD has announced W6600 so RX 6600 XT should be supported by macOS. Anyone wants to try after August 11?
I bought the AMD Radeon W6600 Pro 8GB and tested, I had the SMBIOS 20,1 and it didn't work, I saw a video that a guy tried with a EGPU the W6600 and it didn't work but he said it just work in the MACPRO7,1, I changed to that smbios, I have the 11.6 update already, and it doesn't work sadly, I think the only GPU that works is the W6800, or I have to do something additional to make it work?, any ideas?
 

trs96

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I think the only GPU that works is the W6800
The 6900s are also supported but of course, cost even more.

I have to do something additional to make it work?, any ideas?
Wait for Apple to support it. Whether they will or not is anyone's guess. I don't think they will.
 
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Dec 20, 2019
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asrock z390 pro4
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asus vega64
My XFX Merc 319 RX 6800 XT has Device ID 0x73BF, works great on macOS and the card itself next to silent when fully loaded. Recommended - if you can find one.
How do you make it run at full load? My 6900xt hardly works in FCPX
 
Joined
May 29, 2012
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Gigabyte Z390 Gaming X
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i9-9900K
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6900XT
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How do you make it run at full load? My 6900xt hardly works in FCPX

I haven't really looked into this, but there have been discussions in the past about getting FCPX to use the dGPU. I think one of the major factors is the SMBIOS. If you use an SMBIOS of a Mac that doesn't have an iGPU, like a MacPro, you can get the dGPU to do most of the functions. If you use an SMBIOS of a Mac that has an iGPU, it will split the workload between the iGPU and dGPU.

However, if you change the SMBIOS while you may gain a function, you may lose another. For example Sidecar will only work on an SMBIOS with an iGPU, like an iMac. Similarly, watching DRM protected videos seem to require a specific SMBIOS (I don't recall what the specifics are; I don't watch videos on my Hack).

Other than that, there are tutorials on the web that describe how to offload the work onto the dGPU. I haven't used FCPX in a while, but I seem to remember last year there was a setting in the Preferences where you could specify to use the dGPU for encoding.

See if there is something useful in this thread:

 
Last edited:
Joined
Oct 21, 2021
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Apple MacBookPro16,1 - 1715.40.15.0.0 - OpenCore
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SUCCESS: My Sapphire RX 6900XT Toxic Extreme Edition (Device ID 0x73AF) now works !!!!!!

I would like to thank the CaseySJ for providing the files needed to get my video card working.
These files and explanations are located at:
https://www.tonymacx86.com/threads/success-radeon-rx-6800-xt-big-sur.306736/post-2244068
and
https://www.tonymacx86.com/threads/success-radeon-rx-6800-xt-big-sur.306736/post-2244286
Also FakePCIID.kext is needed.

My EFI is attached.

Before EFI Changes:

View attachment 521904


View attachment 521906
My System: Using gfxutil:
03:00.0 1002:73af /PCI0@0/D0A0@1,1/D0A7@0/pci-bridge@0/GFX0@0 = PciRoot(0x0)/Pci(0x1,0x1)/Pci(0x0,0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)

I modified \ACPI\SSDT-Change-GPU-Device-ID.dsl to match my system and compiled with MaciASL.app to create SSDT-Change-GPU-Device-ID.aml. (This was to fake out the PCI-Bridge).

I used \Kexts\FakePCIID.kext & \Kexts\FakePCIID_RX6000_Graphics.kext with no changes.

After EFI changes:


View attachment 521908


View attachment 521909
IORegistryExplorer.app

View attachment 521910
I'm trying to use a XTHX gpu with my MacBook Pro. Are the two FakePCIID... kexts enough? I have a bootloader (Kryptonite) that uses the same EFI except very slimmed down.
 

Gigamaxx

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I'm trying to use a XTHX gpu with my MacBook Pro. Are the two FakePCIID... kexts enough? I have a bootloader (Kryptonite) that uses the same EFI except very slimmed down.
The latest WEG, device properties device ID, and SSDT-BRG0.aml.
 
Joined
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Apple MacBookPro16,1 - 1715.40.15.0.0 - OpenCore
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i9-9980HK
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UHD 630 + Radeon Pro 5500M
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  1. MacBook Air
  2. MacBook Pro
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  1. iOS
The latest WEG, device properties device ID, and SSDT-BRG0.aml.
I added the two FakePCIID... kexts as well as WhateverGreen.kext to EFI/OC/Kexts & to info.plist. I wasn't able to find "SSDT-BRG0.aml." Is it the same as "SSDT-Change-GPU-Device-ID.aml"? If so, are there any device specific changes needed (ignoring the cosmetic name change)? Furthermore, I don't know what you mean by "device properties device ID" as my device ID is the same as the one used in the post I originally replied to. Is "device properties" a separate item on your list from "device ID"? Lastly, is WhateverGreen.kext redundant/conflicting with Kryptonite.kext? I haven't tested this yet.
 
Joined
Dec 11, 2016
Messages
44
Motherboard
Asrock TRX40 Creator
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AMD 3970x
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Sapphire RX 6900XT Toxic Extreme Edition (Device ID 0x73AF)
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  1. MacBook Pro
Mobile Phone
  1. iOS
The attached file is the SSDT-BRG0.aml, only named differently. I chose to name mine SSDT-GFX0.aml. The .dsl file is what is used before compiling with MaciASL.app. Also, the two FakePCIID files can go away if you use WhateverGreen.kext. Also, you will need to add the latest boot-arg to your config.plist: agdpmod=pikera
 

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Joined
Oct 21, 2021
Messages
38
Motherboard
Apple MacBookPro16,1 - 1715.40.15.0.0 - OpenCore
CPU
i9-9980HK
Graphics
UHD 630 + Radeon Pro 5500M
Mac
  1. MacBook Air
  2. MacBook Pro
Mobile Phone
  1. iOS
The attached file is the SSDT-BRG0.aml, only named differently. I chose to name mine SSDT-GFX0.aml. The .dsl file is what is used before compiling with MaciASL.app. Also, the two FakePCIID files can go away if you use WhateverGreen.kext. Also, you will need to add the latest boot-arg to your config.plist: agdpmod=pikera
Do I need to modify SSDT-BRG0 for my specific card (Powercolor Red Devil 6900 XT Ultimate)?
 
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