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[Success] Radeon RX 6800 XT - Big Sur

Joined
Nov 23, 2020
Messages
6
Motherboard
MSI Z490A-PRO
CPU
i7 10700
Graphics
RX 6800
I have 2 monitors Gigabyte 27", 2K, works flawless, on 144 Hz. Is stable for me with 7,1 definition, no WE enabled, and pikera as boot arg. Both monitors on DP port, since the HDMI I use for a 21" graphic display pen (works also fine is seen as 3rd display).

Oh interesting, no WE.

I'm kicking myself (a little). I have a 6800 (non-XT) sitting here for months, waiting for support. I've been running a Sapphire 5700 XT in a new build since last summer, but ever since 11.3 have been dealing with green screens multiple times per day (like 5+). This week, because I couldn't stand the green screens any more, and didn't know if 6800 support was actually ever going to come, I dropped US$410 on a used RX 580. Running blissfully stable.

Guess, I'll try the 6800 now, for a few days, and if it is stable, sell off the RX 580 and 5700 XT.

Thanks for the quick feedback on the multi-monitor, I've got dual 4K's that I typically run at 3008x1692.
 
Joined
Mar 6, 2013
Messages
272
Motherboard
Gigabyte X299X Designare 10G
CPU
i9-10980XE
Graphics
AMD 6900XT
Mobile Phone
  1. Android
Now that 11.4 beta 1 is on the public seed:
1619117272138.png


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!
 
Joined
Oct 24, 2013
Messages
994
Motherboard
Asus ROG Z690 Formula
CPU
i7-12700K
Graphics
RX 6800 XT
Mac
  1. iMac
  2. MacBook
  3. MacBook Pro
Mobile Phone
  1. iOS
Imac20,1 also works for me. With 0.6.9 development files and the associated kexts.
 

Gigamaxx

Moderator
Joined
May 15, 2016
Messages
6,581
Motherboard
GIGABYTE X470 Arous Gaming 7 WiFi
CPU
Ryzen R9 3900X
Graphics
RX 480
Mac
  1. iMac
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!
I have no audio out of the USB C yet. Do you have any audio through USB C?
 
Joined
Mar 6, 2013
Messages
272
Motherboard
Gigabyte X299X Designare 10G
CPU
i9-10980XE
Graphics
AMD 6900XT
Mobile Phone
  1. Android
I have no audio out of the USB C yet. Do you have any audio through USB C?
I certainly have audio detected on USB-C; all my monitors show up as sound outputs.

However the monitor I currently have plugged into the USB-C does not have any speakers, so I can't test it. I only have one monitor with speakers and it's on one of the DP ports.

Tomorrow I will swap the connectors and let you know.


EDIT: It works, I do have DP sound from the USB-C port.
 
Last edited:
Joined
Mar 6, 2013
Messages
272
Motherboard
Gigabyte X299X Designare 10G
CPU
i9-10980XE
Graphics
AMD 6900XT
Mobile Phone
  1. Android
I have no audio out of the USB C yet. Do you have any audio through USB C?
Actually I just remembered that that monitor has a 3.5mm sound output jack. I plugged in some headphones and yes, I do have working DP sound on the USB-C port.
 
Joined
Mar 20, 2013
Messages
34
Motherboard
Z390 Phantom Gaming-ITX/ac
CPU
i9-9900K
Graphics
RADEON VII
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!
Sounds GOOD :thumbup:
I'd like to see a comparison in ADOBE SUITE & DAVINCI with Radeon VII,
by the way...I don't think that at this moment selling my R.VII to add money and get a 6900 XT could be a good idea ... especially because in my opinion the next M1 will be very interesting for the productivity of these applications :D
For me, who already have an excellent card for my needs, it is better to wait along the river bank
... for those who have a 580 or for those who want to build a Hack right now it would certainly be the card to buy :headbang:

... but not at current prices!:banghead:
 
Joined
Jul 20, 2018
Messages
22
Motherboard
X299 Sage 10G
CPU
i9 10980XE
Graphics
Radeon VII
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!
Could you run Blackmagic Raw speed test?
 
Joined
Mar 6, 2013
Messages
272
Motherboard
Gigabyte X299X Designare 10G
CPU
i9-10980XE
Graphics
AMD 6900XT
Mobile Phone
  1. Android
Could you run Blackmagic Raw speed test?
1619129229836.png


Is that good? I don't have anything to compare it against. Judging by fan/coil whine noise it only stresses the GPU for a second or two at a time.
 
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