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[Success] Radeon RX 6800 XT - Big Sur

Joined
Mar 6, 2013
Messages
273
Motherboard
Gigabyte X299X Designare 10G
CPU
i9-10980XE
Graphics
AMD 6900XT
Mobile Phone
  1. Android
I know that the drivers are not in yet, but others have reported that basic framebuffer output is working?

The match ID for 6700XT is in the 6000 kext, when I checked last week.
Up to and including 11.2.3, you get a GUI and can proceed unaccelerated, which is pretty unpleasant but technically usable. At least you did with the 6800/6800XT/6900XT - I don't know for certain if the same applies to the 6700XT.

Since the first beta of 11.3, the (temporary/incomplete) framebuffer definitions were removed. Some kexts load - like AMDRadeonX6000Framebuffer.kext, but with no FB definitions you get no picture on the monitor or GUI (unless you have a second GPU installed.)
 
Joined
May 25, 2011
Messages
12
Motherboard
MSI MAG B550M MORTAR WIFI
CPU
Ryzen 5900X
Graphics
Radeon RX580 / 6700XT
Mac
  1. MacBook Pro
Mobile Phone
  1. iOS
Up to and including 11.2.3, you get a GUI and can proceed unaccelerated, which is pretty unpleasant but technically usable. At least you did with the 6800/6800XT/6900XT - I don't know for certain if the same applies to the 6700XT.

Since the first beta of 11.3, the (temporary/incomplete) framebuffer definitions were removed. Some kexts load - like AMDRadeonX6000Framebuffer.kext, but with no FB definitions you get no picture on the monitor or GUI (unless you have a second GPU installed.)
Thank you for the info! Looks like I have to revert to 11.2 then. All I need right now is to transfer files sometimes.
 
Joined
Nov 13, 2016
Messages
500
Motherboard
Gigabyte Z270M-D3H
CPU
i3-7350K OC 4.5GHz
Graphics
RX 580
Mac
  1. MacBook
  2. MacBook Pro
  3. Mac Pro
Classic Mac
  1. Classic
Mobile Phone
  1. iOS
I know that the drivers are not in yet, but others have reported that basic framebuffer output is working?

The match ID for 6700XT is in the 6000 kext, when I checked last week.
If you have the RX580 you have one of the most compatible. Why use framebuffer?
 
Joined
Mar 26, 2021
Messages
3
Motherboard
Z490M Prime Plus
CPU
I5 10400
Graphics
RX 6800
Up to and including 11.2.3, you get a GUI and can proceed unaccelerated, which is pretty unpleasant but technically usable. At least you did with the 6800/6800XT/6900XT - I don't know for certain if the same applies to the 6700XT.

Since the first beta of 11.3, the (temporary/incomplete) framebuffer definitions were removed. Some kexts load - like AMDRadeonX6000Framebuffer.kext, but with no FB definitions you get no picture on the monitor or GUI (unless you have a second GPU installed.)
Hold on, in this case, can I used Intel iGPU as framebuffer for my RX 6800? Sound crazy to me tho, nice if it's works.
 
Joined
Mar 6, 2013
Messages
273
Motherboard
Gigabyte X299X Designare 10G
CPU
i9-10980XE
Graphics
AMD 6900XT
Mobile Phone
  1. Android
Hold on, in this case, can I used Intel iGPU as framebuffer for my RX 6800? Sound crazy to me tho, nice if it's works.
In 11.3, a 6000-series GPU can not be used for anything. It won't give a picture, it won't show up as a Metal or OpenCL GPU, it can't be used for any computing tasks.

In 11.2, a 6000-series GPU will give a basic unaccelerated picture - meaning you can see macOS and move the mouse cursor around. It'll be choppy and slow, but it does provide a way to access the OS. But it still won't show up as a Metal or OpenCL GPU, so it can't be useful for any computing task.

If you already have another GPU, like an iGPU, then there's currently no reason to have the 6000-series GPU active in macOS at all; it's not going to do anything useful for you, and it will break sleep.
 
Joined
Mar 26, 2021
Messages
3
Motherboard
Z490M Prime Plus
CPU
I5 10400
Graphics
RX 6800
In 11.3, a 6000-series GPU can not be used for anything. It won't give a picture, it won't show up as a Metal or OpenCL GPU, it can't be used for any computing tasks.

In 11.2, a 6000-series GPU will give a basic unaccelerated picture - meaning you can see macOS and move the mouse cursor around. It'll be choppy and slow, but it does provide a way to access the OS. But it still won't show up as a Metal or OpenCL GPU, so it can't be useful for any computing task.

If you already have another GPU, like an iGPU, then there's currently no reason to have the 6000-series GPU active in macOS at all; it's not going to do anything useful for you, and it will break sleep.
The reason I have to use dGPU because Intel iGPU only output HDMI 1.4, I could not get to 4k60 at all. I was hopeful for a hackjob to fully used HDMI 2.1 4k120.
 
Joined
Nov 13, 2016
Messages
500
Motherboard
Gigabyte Z270M-D3H
CPU
i3-7350K OC 4.5GHz
Graphics
RX 580
Mac
  1. MacBook
  2. MacBook Pro
  3. Mac Pro
Classic Mac
  1. Classic
Mobile Phone
  1. iOS
I just hope that *if* we get drives for the 6000 series, they are more stable than the 5000 series cards. I'm still having issues with my 5700xt. I recently considered trying to find a RX580, but they are too expensive for how old they are for me to justify buying one, and I have doubts that a 580 could run my 49" ultra wide very well.
People have a lot of issues with Windows drivers on the newest cards so not sure they would be much better if ever released for macOS.

I believe the rx580 would likely be able to run your monitor just fine. Now, how well would depend on your need and expectation. I had my rx580 as both a hack and an eGPU for my MBP 16 and ran a 4k monitor plus a separate 1080p just fine with high refresh and very good performance in everything I threw at it.

Not saying it would be worth buying something right now but just mentioning my experience. I chose not to pursue higher-end cards in favor of buying an M1 MacBook Pro. No regrets.
 
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Joined
Mar 31, 2021
Messages
9
Motherboard
MSI X470 Gaming Plus Max
CPU
AMD 3900X
Graphics
AMD RX 560 2GB / RX 6800
After selling my 5700 XT and getting a RX 6800, I've got a RX 560 2GB to use it on macOs. It works very well on my 1440p 144hz screen.
I've also tried RX 460 gb with a 4k 60hz screen, works great. I think animations are even smoother than 5700 xt.
I don't do GPU intensive work on macOs, so it's good enough for software development, web browsing and watching 4k videos.

My only issue is, macOs doesn't boot with RX 6800, I couldn't disable it with config file or DSDL. So my solution is to unplug one of the power cables of the GPU before I boot macOs. Then I plug it again before I boot to windows. I've disabled the screen output of RX560 on windows disaplay settings, so it only uses about 8 watts. (Do not disable it in Device manager, otherwise it won't go idle). They are both connected to the same monitor with seperate cables.
 
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