MP All Models AMD Radeon RX 6800 XT / 6900 XT for macOS?

[h9826790]

I bought a used ASUS AMD Radeon RX 6600 XT, patched it with your method. It runs on a MacPro 3,1 a 4,1>5,1 and a 5,1. However, the card is not registering correctly and has therefore no acceleration.

I did an OpenCore 0.6.1 clean install of Monterey 12.6.3 on all three MacPros with an ATI Radeon HD 5770 and then switched to the RX 6600 XT.

My Radeon RX 580 works perfectly fine under this conditions.

I have no idea what is missing with the RX 6600 XT, maybe I will patch the card one more time.

Always install macOS with the GPU you want to use by using OCLP.

5770 isn't a supported card, OCLP will patch the OS for you, which somehow may cause issue to other natively supported GPU.

This isn't Syncretic patch's fault.

Also, I believe you mean OCLP 0.6.1 but not OpenCore 0.6.1. Otherwise, the OC version is way too old.

 

[thomasfactory]

Always install macOS with the GPU you want to use by using OCLP.

5770 isn't a supported card, OCLP will patch the OS for you, which somehow may cause issue to other natively supported GPU.

This isn't Syncretic patch's fault.

Also, I believe you mean OCLP 0.6.1 but not OpenCore 0.6.1. Otherwise, the OC version is way too old.

“Always install macOS with the GPU you want to use by using OCLP.”
5770 isn't a supported card, OCLP will patch the OS for you…”

I cannot initiate the installation of Monterey with the AMD Radeon RX 6600 XT. The boot sequence crashes in the first half before I even get to the recovery screen.

With the ATI Radeon HD 5770 on the other hand the installation of Monterey works without problems. Only after I installed the root patches I can switch the cards and boot with the RX 6600 XT.

 

[h9826790]

“Always install macOS with the GPU you want to use by using OCLP.”
5770 isn't a supported card, OCLP will patch the OS for you…”

I cannot initiate the installation of Monterey with the AMD Radeon RX 6600 XT. The boot sequence crashes in the first half before I even get to the recovery screen.

With the ATI Radeon HD 5770 on the other hand the installation of Monterey works without problems. Only after I installed the root patches I can switch the cards and boot with the RX 6600 XT.

May be you can try to use the VMM method, that may give you better compatibility during Monterey installation. There is no need to patch Monterey on the 5,1

Activate AMD hardware acceleration

I created a new "easy to install package" as per many requested (based on the official OpenCore). [The attached package updated to 1.0.0] For those who only need HWAccel, post #594 has everything you need. This new package mainly offer HWAccel + boot screen. Also, this package should work in...

forums.macrumors.com

 

[flowrider]

Geekbench 6.0 Rewleased here's my NcMP 7,1 with a Gigabyte TX6800XT - Metal:



Score is up from Geekbench 5.

Lou

 

[avro707]

Geekbench 6.0 Rewleased here's my NcMP 7,1 with a Gigabyte TX6800XT - Metal:

View attachment 2158679

Score is up from Geekbench 5.

Lou

Nice one! Go the unloved "dead to Apple" legacy machines! Our old tanks aren't done yet.

 

[betovzky]

I can report substantial increases on my Pro Vega II and RX 6900 XT too!

 

[hwojtek]

Score is up from Geekbench 5.

It's not that your card suddenly got faster with the new edition of Geekbench, it's that GB scores are only comparable between the same edition. 100k in GB5 is not the same as 100k in GB6.

 

[PowerMike G5]

It's not that your card suddenly got faster with the new edition of Geekbench, it's that GB scores are only comparable between the same edition. 100k in GB5 is not the same as 100k in GB6.

Yeah, this same thing happened when GB4 went to GB5. It's going to take a little time to standardize to the new metrics in GB6.

 

[prefuse07]

 

[macsoundsolutions]

 

[prefuse07]

I wonder if macOS version also aids in increasing score?

 

[h9826790]

I wonder if macOS version also aids in increasing score?

It can occationally, e.g. driver efficiency improvement

But in this case, it's the test itself changed. If you compare the detail items at the bottom of that score page, you can see the tests are very different in GB5 and GB6.

 

[flowrider]

I wonder if macOS version also aids in increasing score?

The answer is no. I just ran the Metal test in GB 5, and no change.

Lou

 

[thomasfactory]

May be you can try to use the VMM method, that may give you better compatibility during Monterey installation. There is no need to patch Monterey on the 5,1

Activate AMD hardware acceleration

I created a new "easy to install package" as per many requested (based on the official OpenCore). [The attached package updated to 1.0.0] For those who only need HWAccel, post #594 has everything you need. This new package mainly offer HWAccel + boot screen. Also, this package should work in...

forums.macrumors.com

Thank you for your link with your detailed information about an alternative way for the Monterey installation.

Today I repatched the RX 6600 XT on a friend's Windows PC with the patch Syncretic provided for my specific card model. After that the System Profiler of my Mac showed the correct card. I checked this with the screen of the windows computer, which was connected to the RX 6600XT via HDMI.

Back home I reconnected the MacPro to my Apple 30" Cinema Display via an Apple Dual Link Adapter. As before the card is not recognised correctly.

 

[hwojtek]

Back home I reconnected the MacPro to my Apple 30" Cinema Display via an Apple Dual Link Adapter. As before the card is not recognised correctly.

That would logically lead to a conclusion the card is OK but the dual link adapter is the real culprit here, wouldn't it?
What happens if you connect the ACD directly? (does this GPU even have DVI?) Does the card get recognized?

This adapter you mention, is it Apple miniDP → dual-link DVI? Have you tried another adapter?

It's either time for a new adapter or a new display for you.

 

[thomasfactory]

I tested the following setups:

Monterey 12.6.3 / MacPro 31, MacPro 41>51, MacPro 51

AMD RX 580 8GB
30" Cinema Display over Native DVI-D
== All systems with acceleration ( System Report: Graphics: AMD Radeon RX 580 8GB )

AMD RX 580 8GB
Two 30" Cinema Displays, first over Native DVI-D port, second over DisplayPort and Apple Dual Link Adapter
== All systems with acceleration ( System Report: Graphics: AMD Radeon RX 580 8GB )

AMD RX 6600 XT 8GB
30" Cinema Display over DisplayPort and Apple Dual Link Adapter
== Partly but false recognition ( AMD Card and correct Card-Number, no acceleration, native resolution ( System Report: Graphics: Display 15GB ) )

AMD RX 6600 XT 8GB
30" Cinema Display over DVI-I/DisplayPort Adapter ( 4K@30 Hz )
== Partly but false recognition ( AMD Card and correct Card-Number, no acceleration, 1200x800 resolution ( System Report: Graphics: Display 3GB )

AMD RX 6600 XT 8GB
Whatever Display over HDMI
== Card recognised, acceleration not tested, resolution according card ( System Report: Graphics: AMD Radeon RX 6600 XT 8GB )

It seems that there is nothing wrong with the Apple Dual Link adapter.
It seems the RX 6600 XT cannot communicate with the 30" Cinema Display over DisplayPort ( I tried on 3 monitors ).

I will further test display which can natively be connected to the RX 6600 XT ( DisplayPort or HDMI ).
I will further test if the 30" Cinema Display can be connected to HDMI.
I will test the card recognition without display attached with screen sharing from a second MacPro.

My question though: Can the attached Apple Cinema Display cause the card incompatibility on the MacPro51?

 

[hwojtek]

It seems that there is nothing wrong with the Apple Dual Link adapter.

Try starting with any other monitor connected to the 6600 and plug in the ACD only after you booted to desktop.

I will further test display which can natively be connected to the RX 6600 XT ( DisplayPort or HDMI ).

It will work.

I will further test if the 30" Cinema Display can be connected to HDMI.

There is a ton of adapters that do that, I would try to check a couple of them.

I will test the card recognition without display attached with screen sharing from a second MacPro.

Should be properly detected and provide remote desktop in 1280x1024. There will be no acceleration without a connected display, if I recall correctly.

My question though: Can the attached Apple Cinema Display cause the card incompatibility on the MacPro51?

I still think the combination of this card and this adapter is the problem, and would check a bunch of adapters first.

 

[thomasfactory]

Today I got a used AMD RX580. -- And I have the same problem as with the RX 6600 XT. -- The MacPro41>51 with Monterey 12.6.3 and OCLP 0.6.1 does not register the card.

This time there is no adapter involved, the Apple Cinema Display is plugged directly to the DVI-I port of the RX580.

So next step I will recreate the environment when I saw the RX 6600 XT, -- I will plug in a monitor over HDMI.

 

[mikiotty]

Today I got a used AMD RX580. -- And I have the same problem as with the RX 6600 XT. -- The MacPro41>51 with Monterey 12.6.3 and OCLP 0.6.1 does not register the card.

This time there is no adapter involved, the Apple Cinema Display is plugged directly to the DVI-I port of the RX580.

So next step I will recreate the environment when I saw the RX 6600 XT, -- I will plug in a monitor over HDMI.

Remove all root patches with OCLP after installation and then boot with the 6600XT. After you boot and confirm that the 6600XT is working, reinstall the root patches.
If still doesn’t work, try adding “agdpmod=pikera” to your boot-args in OpenCore configuration plist.

 

[thomasfactory]

Remove all root patches with OCLP after installation and then boot with the 6600XT. After you boot and confirm that the 6600XT is working, reinstall the root patches.
If still doesn’t work, try adding “agdpmod=pikera” to your boot-args in OpenCore configuration plist.

Remove all root patches with OCLP after installation and then boot with the 6600XT.

This, unfortunately, does not work, -- the screen goes off after half the boot sequence.


After you boot and confirm that the 6600XT is working, reinstall the root patches.
If still doesn’t work, try adding “agdpmod=pikera” to your boot-args in OpenCore configuration plist.

I tried to this, it did not work. The root patches are not necessary after I manage to boot with a screen with a native HDMI/DisplayPort interface.


Conclusion for the AMD RX 6600 XT with the Apple Cinema Display and Apple Dual Link Adapter

They do not work together during boot sequence. The screen goes offline with vertical beige stripes.
I can boot with the RX 6600 XT only after I boot with a Genuine Apple ATI Radeon HD 5770 1GB card and apply root patches. But then the card is not recognised.

I must boot with a screen with native HDMI/DisplayPort. Then the RX 6600 XT is registered and works (very fast). If I boot width both screens, the native screen is working fine, but the Apple Cinema Display crashes again. But the Cinema Display works fine after I un- and replug it after start up.

It’s a pity, my Cinema Displays are tip top and I favour them over the modern high-res, high-contrast screens. -- I will receive an other dual-link adapter soon. I hope this will work.


Next project will be to make the RX 580 from eBay work.

 

[thomasfactory]

Try starting with any other monitor connected to the 6600 and plug in the ACD only after you booted to desktop.

It will work.

There is a ton of adapters that do that, I would try to check a couple of them.

Should be properly detected and provide remote desktop in 1280x1024. There will be no acceleration without a connected display, if I recall correctly.

I still think the combination of this card and this adapter is the problem, and would check a bunch of adapters first.

The combination may be indeed the problem. However, they work together after I plug in the Cinema Display after booting the MacPro with a screen with native HDMI/Display ports.

 

[max.1974]

 

[max.1974]

“Always install macOS with the GPU you want to use by using OCLP.”
5770 isn't a supported card, OCLP will patch the OS for you…”

I cannot initiate the installation of Monterey with the AMD Radeon RX 6600 XT. The boot sequence crashes in the first half before I even get to the recovery screen.

With the ATI Radeon HD 5770 on the other hand the installation of Monterey works without problems. Only after I installed the root patches I can switch the cards and boot with the RX 6600 XT.

Hi @thomasfactory if you can contact Olarila com website Maldon have a lot experience to make SSDT for you Opencore, and maybe you need update it. He make my EFI with a little donation (not mandatory) and im sure 100% that he can make it works this issue. Try it.

 

[hwojtek]

View attachment 2161498

It's not a Mac so it does not help.

 

[thomasfactory]

Hi @thomasfactory if you can contact Olarila com website Maldon have a lot experience to make SSDT for you Opencore, and maybe you need update it. He make my EFI with a little donation (not mandatory) and im sure 100% that he can make it works this issue. Try it.

Olarila com: This website is not online.