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[Success] Radeon RX 6800 XT - Big Sur

Gigamaxx

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Alas, no change in AMDX6000HWServices. Supported NAVI devices are still the same 0x73A21002 0x73AB1002 0x73BF1002.

AMDX6000Framebuffer has the same list of NAVI device IDs as before. Device 0x73DF1002 is RX 6700 XT, but the driver does not yet exist. There is no IOKitPersonality for Navi 22 in AMDRadeonX6000.kext.

XML:
    <key>IOKitPersonalities</key>
    <dict>
        <key>AMDGPUWrangler</key>
        <dict>
            <key>CFBundleIdentifier</key>
            <string>com.apple.kext.AMDRadeonX6000Framebuffer</string>
            <key>IOClass</key>
            <string>AMDRadeonX6000_AmdGpuWrangler</string>
            <key>IOMatchCategory</key>
            <string>IOFramebuffer</string>
            <key>IOPCIMatch</key>
            <string>0x73101002 0x73121002 0x73181002 0x73191002 0x731A1002 0x731B1002 0x731F1002 0x73BF1002 0x73601002 0x73621002 0x73401002 0x73411002 0x73431002 0x73471002 0x734F1002 0x73A01002 0x73A21002 0x73A31002 0x73AB1002 0x73AE1002 0x73BF1002 0x73C01002 0x73C11002 0x73C31002 0x73DF1002 0x73E01002 0x73E11002 0x73E21002 0x73FF1002</string>
            <key>IOPCITunnelCompatible</key>
            <true/>
            <key>IOProbeScore</key>
            <integer>60000</integer>
            <key>IOProviderClass</key>
            <string>IOPCIDevice</string>
        </dict>
I’m thinking if they do get more support we may see a split in the 6000 kext series. In Sierra and High Sierra the 9000controller.kext became the 9000, 9250, 9500 series. The 4000 kext became 4000, 4250 etc... they finally settled down in Mojave. At this time we had the RX 400/500 series cards and Apple was using several variations for laptops and desktop models.
The current 6000 kext has first gen Navi and the new RDNA 2 runs in a totally different memory layout. They share the same Navi name but are very different architectures. It would make sense to separate the kexts if more cards are added.
 
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I switched from PowerColor 5700 XT Red Dragon to XFX RX 6800 Qick 319 and everything just worked directly. No changes done in OpenCore or macOS! Using 11.4 Beta 1.

Also, I've been reading through the thread and there seems to be some 6800 XT/6900 XT that have problems and some that seems to work out of the box. How do you know which ones work? I read something about device ID but I'm not sure where I can see that on a store web page.
 
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I switched from PowerColor 5700 XT Red Dragon to XFX RX 6800 Qick 319 and everything just worked directly. No changes done in OpenCore or macOS! Using 11.4 Beta 1.

Also, I've been reading through the thread and there seems to be some 6800 XT/6900 XT that have problems and some that seems to work out of the box. How do you know which ones work? I read something about device ID but I'm not sure where I can see that on a store web page.
you can’t see it on a store web page.

my suggestion is that the thread creator adds a chapter to the main post, where we can list all the tried gpu’s, and let people know what worked and not.

I start:

Powercolor 6900 XT Red Devil (AXRX 6900XT 16GBD6-3DHE/OC), works fine on MacPro7,1 with agdpmod added.
 
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you can’t see it on a store web page.

my suggestion is that the thread creator adds a chapter to the main post, where we can list all the tried gpu’s, and let people know what worked and not.

I start:

Powercolor 6900 XT Red Devil (AXRX 6900XT 16GBD6-3DHE/OC), works fine on MacPro7,1 with agdpmod added.
Thank you for this. I had picked one of those up at Microcenter and was waiting for confirmation before upgrading to Big Sur.
 
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you can’t see it on a store web page.

my suggestion is that the thread creator adds a chapter to the main post, where we can list all the tried gpu’s, and let people know what worked and not.

I start:

Powercolor 6900 XT Red Devil (AXRX 6900XT 16GBD6-3DHE/OC), works fine on MacPro7,1 with agdpmod added.
Good idea.

Sapphire Nitro+ RX6800 works perfectly with iMac 19,1 and agdpmod boot arg
 
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My score is not very good, I see some close to 190000, I must have something wrong.
Screenshot 2021-05-05 at 23.09.05.png
 
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I genuinely don't like geekbench scorcing because doesn't wait long enough to get cpu or gpu out of idle state. I can literally watch it benchmark and see cpu and gpu both spend more than half of bench mark at half speed because by the time it ramps up to full clock it's starting next test and because it also pauses between tests it starts EVRY test with both cpu and gpu below full throttle

The variance in these tests can literally just be x revved up faster than y, or even just that x didn't have working power management and y did, so x started test at full clock but y started it (correctly) from an idle clock.

TL/DR, a proper bench is something that actually operates at full clock for a decent amount of time.
 
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Since you've all found a way to get one, any clues as to where to pick up a 6800xt?
No idea where you're based. But for people in the UK; since yesterday Overclockers have a fair bit of stock, Scan as well, but less stock. Overclockers prices are around £1200 for a 6800XT, £1700–£2400 for a 6900XT.
 
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