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[Success] Radeon RX 6800 XT - Big Sur

Joined
Dec 1, 2012
Messages
71
Motherboard
ASUS ROG Strix F Z390
CPU
i7-9700K
Graphics
6800XT (Powercolor Red Dragon)
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  1. MacBook Pro
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.
Yeah I saw that, completely insane. Could probably get an upcoming 'M2' MBP for that. It seems like when there is stock, only one store has any and so it becomes temporarily a monopoly seller and can more or less charge what it wants.
 
Joined
Jan 22, 2020
Messages
119
Motherboard
AORUS Z390 Master
CPU
i9-9900K
Graphics
RX 6900 XT
Classic Mac
  1. Power Mac
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  1. iOS
1- Update all kexts
2- adding agdpmod=pikera in boot-args
3- remove the RX 580
4- Instal the RX 6900 XT
AND BOMMM!:lol:
I have UHD 630, Radeon™ 64 LC and RX 6900 XT activated, but I have picture dropouts.
Do I have to remove the UHD 630 and the Radeon 64™ LC?
 
Joined
May 11, 2011
Messages
2,374
Motherboard
Gigabyte B550 Vision D
CPU
Ryzen 5900X
Graphics
RX 6800
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  1. iMac
  2. MacBook
  3. MacBook Air
  4. MacBook Pro
  5. Mac mini
  6. Mac Pro
Classic Mac
  1. Power Mac
  2. PowerBook
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I have UHD 630, Radeon™ 64 LC and RX 6900 XT activated, but I have picture dropouts.
Do I have to remove the UHD 630 and the Radeon 64™ LC?
No you don’t need to, you leave it in there. In the Device Properties list for the UHD 630 just find and change the AAPL,ig-platform-id by changing the value to 0300923E, device-id to 923E0000 and adding framebuffer-patch-enable with value of 01000000 - this will turn the iGPU output into headless mode and enable Intel Quicksync.

For the picture dropouts, maybe try using shikigva=128 in the boot-args.

For convenience you can disable the 64 LC in BIOS by going to the relevant card‘s PCIe slot and selecting Storage mode before booting into your OS of choice. That way it leaves you to still be able to use the card when you want without having to physically take it out.
 
Joined
Nov 5, 2010
Messages
506
Motherboard
MSI TRX40 Creator
CPU
AMD Threadripper 3970X
Graphics
Sapphire Nitro+ RX 6900 XT
Mac
  1. Mac Pro
Mobile Phone
  1. iOS
Joined
May 11, 2011
Messages
2,374
Motherboard
Gigabyte B550 Vision D
CPU
Ryzen 5900X
Graphics
RX 6800
Mac
  1. iMac
  2. MacBook
  3. MacBook Air
  4. MacBook Pro
  5. Mac mini
  6. Mac Pro
Classic Mac
  1. Power Mac
  2. PowerBook
Mobile Phone
  1. iOS
Joined
Nov 5, 2010
Messages
506
Motherboard
MSI TRX40 Creator
CPU
AMD Threadripper 3970X
Graphics
Sapphire Nitro+ RX 6900 XT
Mac
  1. Mac Pro
Mobile Phone
  1. iOS
Thanks for that...I wasn't aware of it. I know most folks use agpdmod=pikera these days. Considering it's referenced in the Dortania guide, I didn't expect that.
agpdmod=pikera only fixes black screen for certain GPUs, not related to DRM functionality.
 
Joined
Mar 10, 2018
Messages
52
Motherboard
Gigabyte Z490 Aorus Elite AC
CPU
i7-10700KF
Graphics
RX 6800
Mac
  1. iMac
Mobile Phone
  1. iOS
Do you have a full backup? Also I find that if you have a spare drive with enough space, you could clone it using CCC or SuperDuper, and then make sure to move over the EFI folder as well. Then you can do the update to 11.4 via USB drive and test it out. I would also prob before doing the update, sign out of all Apple ID (iMessage, FaceTime, iCloud), as you will most likely be maybe using a different SMBIOS, and you do not want to be signed in when switching. PM, me if need any help. I just did the 10.13.6 (TitanXP) to 11.4.1(6900xt) on my hack. Everything went perfectly!
It’s weird I didn’t get a noti for this response. Thank you. I have a cloned drive already. I’m gonna wait for 11.4 to released and then make the switch. I will dm you when I decide to do it!
 
Joined
Jan 31, 2021
Messages
15
Motherboard
Asus Z690 Formula
CPU
12900K
Graphics
MSI 6800 XT Gaming X Trio
Anyone else had a big drop in GPU performance in 11.4 public beta 2 ? I was getting 178000 in metal on Beta 1 and now only getting 145000 in Beta 2... I have the MSI 6800xt Gaming x Trio
 
Joined
Mar 5, 2014
Messages
4
Motherboard
x79 Sabertooth
CPU
4930k
Graphics
GTX TITAN
hello guys any of you test a transcoding to proress lt in davinci resolve or any kind of test doing transcoding? with 6800xt or 6900xt ? i will buy this card soon.
 
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