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[Success] Radeon RX 6800 XT - Big Sur

Joined
Aug 1, 2011
Messages
67
Motherboard
Asus Z590 Hero XIII
CPU
i9 11900k
Graphics
6900XT
Mac
  1. iMac
  2. MacBook
  3. MacBook Air
  4. MacBook Pro
  5. Mac mini
  6. Mac Pro
Classic Mac
  1. 512K
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Now that 11.4 beta 1 is on the public seed:
View attachment 515952

My 6900XT findings so far, tested on X299 i9-10980XE.
  1. agdpmod=pikera required to avoid black screen on boot, including on MacPro7,1 SMBIOS.
    1. No surprise as the X6000 kext series has been re-used for Big Navi.
    2. I haven't tested without WhateverGreen.
  2. Multi-monitor works perfectly. I have four monitors connected.
    1. I'm using: 2 x DP, 1 x HDMI, 1 x USB-C to DP
    2. One monitor is 3840x2160, other three are 1920x1200. All are 60hz.
  3. H264/H265 encode/decode are both working fine.
  4. HDMI/DP sound is working.
  5. Sleep/wake is working fine.
  6. Fans seem OK so far: still when the card is idle, spinning up when it's not.
  7. Benchmarks:
    1. GeekBench 5.4 Metal: max 183k, lowest 160k
    2. GeekBench 5.4 OpenCL: max 122k, lowest 111k
    3. Octane X "Chess Set Procedural" : 11 seconds
      1. Compared to: Radeon Pro Vega II - 18s; Radeon VII - 19s; NVidia 2070 - 19s; 5700XT - 21s
      2. This result is particularly pleasing - nearly double the performance of the 5700XT, and 40+% faster than the Radeon Pro VII and standard VII.
      3. I'd love to see a figure comparing it to a 3080 on CUDA, I reckon it'd be close.
So far, looking good!
Have you had any issued with waking from either sleep/display off? I'm guessing its the USB Type-C causing the issue, but I'm only using Display port for now. Just curious if you had any issues like that.
 
Joined
Mar 6, 2013
Messages
272
Motherboard
Gigabyte X299X Designare 10G
CPU
i9-10980XE
Graphics
AMD 6900XT
Mobile Phone
  1. Android
Have you had any issued with waking from either sleep/display off? I'm guessing its the USB Type-C causing the issue, but I'm only using Display port for now. Just curious if you had any issues like that.
No, all good from both display sleep and normal sleep.
 
Joined
Aug 1, 2011
Messages
67
Motherboard
Asus Z590 Hero XIII
CPU
i9 11900k
Graphics
6900XT
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  2. MacBook
  3. MacBook Air
  4. MacBook Pro
  5. Mac mini
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  1. 512K
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No, all good from both display sleep and normal sleep.
Good to know. If I remove the display port and plug back in, its back up. So it seems like its not holding onto the signal. Weird.
 
Joined
Mar 6, 2013
Messages
272
Motherboard
Gigabyte X299X Designare 10G
CPU
i9-10980XE
Graphics
AMD 6900XT
Mobile Phone
  1. Android
Good to know. If I remove the display port and plug back in, its back up. So it seems like its not holding onto the signal. Weird.
When I first put the card in my X299 I had an issue where the monitor connected to USB-C was not detected from boot - no signal. I had to unplug and replug the connector, and then it came online normally.

Shortly afterwards I realised I still had DeviceProperties entries in my OC config.plist intended for my Vega 64 GPU, which was both renaming the GPU to "AMD RX Vega 64 16GB" and setting device ID etc :)

As soon as I removed that, the GPU was named correctly and all ports work fine on boot, and after sleep/wake.

So do double check you don't have any SSDTs or DeviceProperties that you put in for your old GPU that might be affecting this one :)
 
Joined
Jan 19, 2019
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Z390 M Gaming
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i9-9900
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RX 580
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Joined
Oct 24, 2013
Messages
989
Motherboard
Asus ROG Z690 Formula
CPU
i7-12700K
Graphics
RX 6800 XT
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The USB-C port on the 6800xt can be connected to a thunderbolt4 dock... you don't get thunderbolt on the downstream thunderbolt ports on your dock; only USB. But you also get displayport/hdmi output working well.

This can be an option for those with a dock and a motherboard with thunderbolt. If you want to use the discrete GPU video output with you dock and your motherboard doesn't have a displayport input for you tunnel your video card's video over thunderbolt, then just plug your dock into the 6800/6900.
 
Joined
Jun 11, 2015
Messages
166
Motherboard
MSI Z97S SLI Krait Edition
CPU
i7-4790K
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RX 6800
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6700 XT doesn't work with these new RDNA 2 drivers... :/
 
Joined
Jan 17, 2020
Messages
42
Motherboard
Aorus Pro Wifi i x570
CPU
3950x
Graphics
6900xt
About the same as 5700xt
Are you sure? Here are some Blackmagic RAW benchmarks from 2019, I am pretty sure AMD must be running in OpenCL here though to be that bad.

1619132045738.png
 
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Joined
Jan 19, 2019
Messages
248
Motherboard
Z390 M Gaming
CPU
i9-9900
Graphics
RX 580
Mac
  1. MacBook Pro
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Joined
Jan 17, 2020
Messages
42
Motherboard
Aorus Pro Wifi i x570
CPU
3950x
Graphics
6900xt
Latest BRST: 10980xe + 5700xt
Oh cool cheers for that. I do wonder if there is a bottleneck with this test? The numbers don't seem to scale correctly for the GPU as they do for the CPU, maybe I am missing something.

I hope the improvement in your score is due to Metal over OpenCL, that could account for the 6000 cards performing poorly under Resolve too. We need test with Pugetbench and see if it improves on this.

Edit - Pugetbench Resolve is Windows only for now - damn it.

1619136245932.png
 
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