[Success] Radeon RX 6800 XT - Big Sur

[tom111]

CSM should be disabled.

 

[odemolay]

Hello @odemolay,

Alas I have still not unboxed the 6800XT. I am waiting for 'something' to arrive before opening and using this card.

thanks @CaseySJ for the response.
I'm looking for real information (that's so much money ... for the GPU)
I don't want to go wrong with a future purchase. as dortania has listed problems with MSI rx 5700 ...

I guess you are working or on Z590 vision D to try this card

anyway thank you for everything you did for hackintosh

 

[CaseySJ]

thanks @CaseySJ for the response.
I'm looking for real information (that's so much money ... for the GPU)
I don't want to go wrong with a future purchase. as dortania has listed problems with MSI rx 5700 ...

I guess you are working or on Z590 vision D to try this card

anyway thank you for everything you did for hackintosh

Have you seen these posts earlier in this thread regarding the MSI 6800XT Gaming X Trio?

[Success] Radeon RX 6800 XT - Big Sur

Sapphire 6800XT should be fine. 6700XT is a no go. There are several specifications for this Sapphire card's, is there any difference between them or all this card will compatible?: 1. Sapphire NITRO+ 2. Sapphire PULSE 3. Sapphire NITRO+ SE 4. Sapphire 21304-01-20g Thanks

www.tonymacx86.com

[Success] Radeon RX 6800 XT - Big Sur

Anyone have any luck using the XFX Speedster MERC 319 RX6900XT Black? Are non-reference cards still a no-go? The (RX-69XTACBD9) has the same port config as a reference card.

www.tonymacx86.com

[Success] Radeon RX 6800 XT - Big Sur

Finally, it's alive! MSI 6800xt Gaming X Trio 3xDisplayport 1x HDMI Running triple 4k. Few bits of strange behaviour, seems like OSX is hogging a lot of memory compared to when I was using the 5700xt and it goes to full memory utilisation when I load logic. Oddly I can no longer boot when...

www.tonymacx86.com

 

[odemolay]

thanks @CaseySJ
yes I think I read almost all the messages before getting bored
nothing is very clear, -weggoff, pikera or not, with some, not with others users.
I understand that it depends on smbios 7.1 or 19.1. HDMI or DP
output black screen during boot ... or during a new installation ... depend of brands.
0x73BF is the only thing certain now.
things got murky when the posts started talking about Bios XT, XTX and XTX (h). sometimes in contradiction according to the models of cards with the site technopowerup.
suddenly my hands started to get sweaty ...
that's why I preferred to ask you directly.

 

[CaseySJ]

thanks @CaseySJ
yes I think I read almost all the messages before getting bored
nothing is very clear, -weggoff, pikera or not, with some, not with others users.
I understand that it depends on smbios 7.1 or 19.1. HDMI or DP
output black screen during boot ... or during a new installation ... depend of brands.
0x73BF is the only thing certain now.
things got murky when the posts started talking about Bios XT, XTX and XTX (h). sometimes in contradiction according to the models of cards with the site technopowerup.
suddenly my hands started to get sweaty ...
that's why I preferred to ask you directly.

Haha! I understand.

All 6800-series cards need a little bit of experimentation to see which product name (MacPro or iMac, etc) and which boot arguments work best. This card is 0x73BF, so it is natively supported in Big Sur. The devil is always in the little details. I just wish that this card contained one USB-C port because I have two 4K monitors with USB-C video input.

 

[Rocket88]

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:

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:

IORegistryExplorer.app

 

[MysticalOS]

Wait you got it working without reflashing card with invalid bios? what sorcery is this? cause I'm running my clock 400mhz slower using wrong bios.

 

[Rocket88]

Wait you got it working without reflashing card with invalid bios? what sorcery is this? cause I'm running my clock 400mhz slower using wrong bios.

I couldn't flash my card. The AMD Flasher would not let me do this because of mismatches and when I tried to edit my own BIOS, it told me to jump in the lake. Actually it said Error FL001 or something like that.

 

[MysticalOS]

I finally got that method working. I was using an older version of DSL that had RM, in front of device ID changer, that's why it was only changing name and not ID. i got it working now and that means now my card should be running at it's full clock rate.

 

[byteminer]

Can confirm that this worked for me as well. It's a bit strange since I did the exact same thing some Betas prior. Maybe something changed internally in how this is handled which somehow made this possible recently. Alternatively maybe I just overlooked something obvious and that's why it didn't work.

Either way, my card also now runs via the Spoofed ID. This has had two effects:
- I lost HDMI Audio
- The coil whine has severely reduced (likely because it can now run with the proper VBIOS)