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[Sticky] Radeon RX 6800 / RX 6800 XT / RX 6900 XT for macOS -> AMD Navi RDNA2 Support added in 11.4 Beta  

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carauz90
(@carauz90)
New Member
Joined: 2 months ago
 

@fran_serrano, I really hope so... but as I see it, the RT 6700XT will not be supported before the release of MacOS 14.5 (beta). Hopefully I'm wrong.

 

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

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Fran Serrano
(@fran_serrano)
Active Member
Joined: 2 months ago
 

@carauz90, thanks.

Where did you read that? Is there any other information?

 

Surf, drums, Java/script


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joevt
(@joevt)
Noble Member
Joined: 4 years ago
 
Posted by: @arvin

thanks for your help. From the Mac system report:

(after comes the AGDCDiagnose report)

The AGDCDiagnose has the EDID for Samsung TV with product ID 703F, but the log shows that product IDs 703E and 7040 also exist. Those other two may be for different ports of the TV (or different settings) and may have other different EDID info.

The TV is using an HDMI connection (no DisplayPort info). I can't tell if the connection is working as HDMI 2.1 because it's only using 4K60 HDMI 2.0 timing (10bpc HDR 4:2:0). You appear to be using a 8K scaled HiDPI mode (Looks like 4K) that is scaling down to 4K in the GPU. That may be redundant. Or you need to change the "Scaled resolutions base" option in SwitchResX to 7680x4320? Well, no point doing that until you can confirm a working 8K timing.

Regarding the EDID for 703F, It does include 8K timings (not custom timings - these are VIC codes from CTA-861 spec) up to 60Hz but in the EDID base block, it has a limit of 1190MHz which is only good enough for 30Hz - it should be 2376MHz for 60Hz. The horizontal limit is 255kHz which is good enough for 50Hz but should be 270kHz for 60Hz. SwitchResX has options for overriding the frequency ranges. Check the current values, post a screenshot. Maybe override them if the ranges are lower than needed for 8K60.

The EDID shows that the HDMI port supports HDMI 1.4 and HDMI 2.0 links (3 lanes, 3.4 Gbps and 6 Gbps each) and HDMI 2.1 links (4 lanes, 6, 8, 10 Gbps but not 12 Gbps).

HDMI 2.1 (10 Gbps/lane) modes (assuming HDMI timings, no DSC):
- 4K60 16bpc 4:4:4 (but the EDID has no mention of anything greater than 10bpc)
- 4K120/8K30 8bpc 4:4:4, 10bpc 4:2:2
- 8K60 8bpc 4:2:0

DisplayPort 1.4 modes (assuming HDMI timings, no DSC):
- 4K60 12bpc 4:4:4 (but the EDID has no mention of anything greater than 10bpc)
- 4K120/8K30 10bpc 4:2:0
- 8K60 6bpc 4:2:0 (Macs don't support 6bpc, 4:2:0 doesn't support 6bpc)

I'm not sure if DSC is supported. Certainly the card supports it but I'm not sure about the OS and the driver. The CAC-1085 will be limited if DSC is not used. AGDCDiagnose can definitely tell if DSC is used in the DisplayPort case but the HDMI 2.1 case is new to me - I won't know if it supports DSC unless someone shows that it does. Big Sur has an issue where it doesn't always use DSC where Catalina would use DSC, but you can't use the Navi21 cards with Catalina so that can't be tested...

When you install SwitchResX, enable "Show best resolutions for display in bold". These are the non-scaled modes which are actual timings. For each timing, there should be a HiDPI mode and a non-HiDPI mode (otherwise known as a low-resolution mode).

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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norcom
(@norcom)
Eminent Member
Joined: 1 year ago
 
Posted by: @fran_serrano

@reinhard1004, I already installed 11.4 beta 2 and still no support for RX 6700XT. Only 6800, 6900 and 6900XT are supported for the time being. We'll need to wait a bit. Maybe in later beta versions the support for our card is added. I would not expect that a particular model like ours is forgotten in the bin.

Cheers,

Fran

 

9to5mac says 11.4 beta 3 is supposed to be out. Any chance you've tested it with a 6700xt yet?

 

This post was modified 1 month ago
2019 16" MacBook Pro (RP5500M) [9th,8C,H] + RX 5700 XT @ 32Gbps-TB3 (Razer Core X Chroma) + Win10 1909 [build link]  

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Fran Serrano
(@fran_serrano)
Active Member
Joined: 2 months ago
 

@norcom, as far as I see, it's not out yet, but be sure I'll test it as soon as possible and keep it posted here.

 

Surf, drums, Java/script


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arvin
(@arvin)
Active Member
Joined: 2 months ago
 

@joevt, all,

I upgraded to the latest MacOS 11.4 beta 3 that came out today, and I installed SwitchResX. From the SwitchResX menu, there seams to be many resolutions (hundreds) to choose from. The Display control panel doesn't show the 8K options still. 

Now 8K@60hz seams to work smooth on the 2018 Mac Mini with AMD 6800 XT, with the Samsung Q800T 8K TV, a first time for me. Text and menu bar appear unbelievably small. I will send screen dumps from SwitchResX and EDID info etc tomorrow. I'm not sure what Chroma subsampling is used and/or DSC, but text is not as crisp/sharp per pixels as with standard lower resolution monitors. Could be the Samsung or the sampling/transfer. 

Arvin

 

Arvin
Mac mini 2018 i5 64GB RAM, MacOS 11.4, eGPU Razer Core X Chroma with ASUS TUF AMD Radeon 6800 XT
MacBook Pro M1 16GB, MacBook Pro late 2013 i7 16GB


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Erik Tank
(@erik_tank)
Trusted Member
Joined: 9 months ago
 

I’m a bit perplexed.  How did you get 8k to work if switchresx doesn’t list 8k as an option?  Was it the latest beta update that allowed it to work?

2019 16" MBP - i9 - 32GB - 5500M 8GB - 1TB SSD w/eGPU 5700XT OC


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itsage
(@itsage)
Founder Admin
Joined: 5 years ago
 

@norcom, No drivers for RX 6700 XT yet on macOS 11.4 Beta 3 [20F5065a].

 

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2020 Gigabyte Z490 Vision D [10th,8C,K] + RTX 2080 Ti @ 32Gbps-TB3 (AORUS Gaming Box) + Win10 2004 [build link]  


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philw
(@philw)
Estimable Member
Joined: 4 years ago
 

Not looking good for 6700xt. Apple engineers have indicated that only support for 6800xt / 6900xt is happening - info from a popular GPU renderer. More info due shortly.

Given up on all my Macs...but successfully running: Gigabyte Designare Z390, Core i9-9900K, 64GB RAM, 2x Internal GTX 1080TI, 2x GTX 1070 eGPU (Sonnet eGFX)

 
2018 Gigabyte Z390 Designare (GTX1080TIx2) [9th,8C,K] + GTX 1070 @ 32Gbps-TB3 (Sonnet Breakaway 350) + Win10 [build link]  


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Fran Serrano
(@fran_serrano)
Active Member
Joined: 2 months ago
 

@itsage, confirmed. I'm on Beta 3 and still not working 🙁

 

@philw, and other bad news state that this beta 3 could be the last beta before MacOS 12. Very sad, though I would find weird that there would be only 3 betas.

 

Surf, drums, Java/script


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