MP All Models AMD Radeon RX 6800 XT / 6900 XT for macOS?

[culser]

Thanks
Maybe it's time to buy 7,1... or sell 6800xt and take a 580 from a basement

yeah or a 590

Why no support for 6800's , I'll bet we were all hoping OCLP would cover it.

 

[tsialex]

Why no support for 6800's , I'll bet we were all hoping OCLP would cover it.

NAVI GPUs are compiled by Apple with AVX2 requirement after Monterey.

Since MacPro5,1/6,1 does not have AVX2 instructions support, OCLP can't do anything about that.

 

[culser]

It’s time to wait just one more moment until owners say goodbye to their dreams and illusions...and then buy 7,1! 😉

I think from now on every half year can make a difference of a few grand, depending on configuration.

7.1 with 580 ? can the CPU, RAM, be Upgraded.

 

[culser]

NAVI GPUs are compiled by Apple with AVX2 requirement after Monterey.

Since MacPro5,1/6,1 does not have AVX2 instructions support, OCLP can't do anything about that.

in theory could someone create a plug in card that emulates this AVX2 ... then OCLP might be able to tackle it ?

 

[tsialex]

in theory could someone create a plug in card that emulates this AVX2 ... then OCLP might be able to tackle it ?

In theory, everything is possible…

While IRL, this is not something even remotely viable economically. Not even a pipe dream.

 

[flyproductions]

7.1 with 580 ? can the CPU, RAM, be Upgraded.

7,1 do have AVX support! You can upgrade to whatever you want (or can afford).

 

[MixMor]

Is there a nice updated video for this install? Pointing all the correct steps and links to files? I'm a complete noob and afraid of screwing up my 400$ rx6800 gpu...
Thanks!

 

[macsoundsolutions]

Is there a nice updated video for this install? Pointing all the correct steps and links to files? I'm a complete noob and afraid of screwing up my 400$ rx6800 gpu...
Thanks!

 

[MixMor]

Hi Lance, thank you very much for the link. I already was a big fan/follower of your videos! Just to double check since this video has more than 2 years now:
- Is this still the best procedure and are all the links to the latest files, right?
Thanks,
Miguel

 

[macsoundsolutions]

Hi Lance, thank you very much for the link. I already was a big fan/follower of your videos! Just to double check since this video has more than 2 years now:
- Is this still the best procedure and are all the links to the latest files, right?
Thanks,
Miguel

is this for a Mac Pro 5,1? you don't need to flash it for a Mac Pro 7,1 only for a 5,1. You know you can only go up to Monterey with a rx6800xt in th e5,1, you need the latest opencore ML or OCLP, and you need to do the pixlas mod to power it. The patching has to be done in a Windows PC or a Mac PRo 7,1 running Windows. The software has been updated but not the patcher. The issue is the newer AMDbflash is without a GUI. So you need to go with an older version that still has the GUI or figure out how to use the new version. I think I have the olde verions of AMDbflash I think it has to be 3.46 or something can't remember. You can download older versions under the latest version.

 

[MixMor]

is this for a Mac Pro 5,1? you don't need to flash it for a Mac Pro 7,1 only for a 5,1. You know you can only go up to Monterey with a rx6800xt in th e5,1, you need the latest opencore ML or OCLP, and you need to do the pixlas mod to power it. The patching has to be done in a Windows PC or a Mac PRo 7,1 running Windows. The software has been updated but not the patcher. The issue is the newer AMDbflash is without a GUI. So you need to go with an older version that still has the GUI or figure out how to use the new version. I think I have the olde verions of AMDbflash I think it has to be 3.46 or something can't remember. You can download older versions under the latest version.

Hi again,
It's for a 5,1 running Monterey 12.7.6 already with ML Opencore (installed using your YouTube video, this July!). I'm trying to flash an eBay bought RX6800 (reference).
Thanks!

 

[mrkapqa]

question: if the radeon rx 6600 is flashed for use with a Mac , can it then still. be used for Windows PC)=?

or would I need a card with DualBIios for that purpose?

It seems there are hardly any DualSlot Cards (RX 6600, 6600XT, or above) with DualBios.

Thanks.

 

[flyproductions]

I'm trying to flash an eBay bought RX6800 (reference).

I'm using this exact card too.

So, if you don't allready have it, you can use this ROM. It has the syncretics patch as well as GOP enabled. So it also gives the native bootscreen without the need to enable GOP in the Mac's bootrom.

 

[macsoundsolutions]

Hi again,
It's for a 5,1 running Monterey 12.7.6 already with ML Opencore (installed using your YouTube video, this July!). I'm trying to flash an eBay bought RX6800 (reference).
Thanks!

Yes then you don’t need the pixlas mod if it’s the non xt. But still needs Syncretic’s patch

 

[Muscovite]

Gentlemen, could you please kindly provide the exact make/models of the 6800XT and the 6900XT that you managed to physically squeeze into your cMP 5,1s length-wise, regardless of whether it is a 3-slot and whether it requires the Pixlas mod or not. If you ended up having to leave the fan in the unlock position because of the card's length, please kindly state that also.

The only ones I see in this forum are the Sonnet 6800XT, the Dell 6800XT and the reference 6800XT's (all of which are imposible to find where I am at). I know the non-XT 6800's would fit but I was hoping to give my 2010 cMP the largest last boost it can handle.

Another question - do you think the flashing process would also work in theory if the card to be flashed were sitting in an eGPU box connected to a mac running Bootcamp Windows? Thanks

 

[mrkapqa]

The only ones I see in this forum are the Sonnet 6800XT, the Dell 6800XT and the reference 6800XT's (all of which are imposible to find where I am at). I know the non-XT 6800's would fit but I was hoping to give my 2010 cMP the largest last boost it can handle

It seems one is left also with few options with the non-XT Version,
only the Rreference Card which is Dual-Slot , but there could be others.

 

[MixMor]

Gentlemen, could you please kindly provide the exact make/models of the 6800XT and the 6900XT, you managed to physically squeeze into your cMP 5,1s length-wise, regardless of whether it is a 3-slot and whether it requires the Pixlas mod or not. If you ended up having to leave the fan in the unlock position because of the card's length, please kindly state that also.

The only ones I see in this forum are the Sonnet 6800XT, the Dell 6800XT and the reference 6800XT's (all of which are imposible to find where I am at). I know the non-XT 6800's would fit but I was hoping to give my 2010 cMP the largest last boost it can handle.

Another question - do you think the flashing process would also work in theory if the card to be flashed were sitting in an eGPU box connected to a mac running Bootcamp Windows? Thanks

This one is on ebay: https://www.ebay.it/itm/17597120261...jdJ22gCRqi&var=&widget_ver=artemis&media=COPY

 

[bwm1974]

Gentlemen, could you please kindly provide the exact make/models of the 6800XT and the 6900XT that you managed to physically squeeze into your cMP 5,1s length-wise, regardless of whether it is a 3-slot and whether it requires the Pixlas mod or not. If you ended up having to leave the fan in the unlock position because of the card's length, please kindly state that also.

The only ones I see in this forum are the Sonnet 6800XT, the Dell 6800XT and the reference 6800XT's (all of which are imposible to find where I am at). I know the non-XT 6800's would fit but I was hoping to give my 2010 cMP the largest last boost it can handle.

Another question - do you think the flashing process would also work in theory if the card to be flashed were sitting in an eGPU box connected to a mac running Bootcamp Windows? Thanks

I have the Gigabyte RX 6800 XT from MacVidCards Europe in my mid-2010 5,1. If I install this card in slot 1, it only blocks slot 2, leaving slots 3&4 available. If I install this card in slot 2, it blocks slots 3&4, leaving only slot 1 available. It's a snug fit, but not difficult. Fan easily locks into place.
I cannot comment on flashing process.
Hope this is helpful to you.

 

[joevt]

What's the current state of HDMI 2.1 support?

For Intel Macs, I noticed some CoreDisplay preferences which might have an effect (though I have no way to test it):

sudo defaults write /Library/Preferences/com.apple.CoreDisplay enableHDMIFRL -bool true
sudo defaults write /Library/Preferences/com.apple.CoreDisplay enableHDMIVRR -bool true
sudo defaults write /Library/Preferences/com.apple.CoreDisplay enable8kVIC -bool true
sudo defaults write /Library/Preferences/com.apple.CoreDisplay enableHDR10 -bool true

enableHDMIFRL - Sequoia, Sonoma
enableHDMIVRR - Sequoia, Sonoma, Ventura
enable8kVIC - Sequoia, Sonoma, Ventura
enableHDR10 - Sequoia, Sonoma, Ventura, Monterey, Big Sur, Catalina

I think Intel Macs are limited to HDMI 2.0 so enablHDMIFRL might get beyond that? 8kVIC probably refers to 8K HDMI modes with pixel clocks 1188MHz (for 30Hz) and/or 2376MHz (for 60Hz). HDMI 2.0 can do 1188MHz with 4:2:0 chroma subsampling. Beyond that requires FRL.

For Intel Macs with GPUs that support DSC, the joevt forks of WhateverGreen and Lilu can reduce DSC bpp from the default 12bpp down to at least 8bpp allowing pixel clocks well beyond 2160MHz which allows higher resolutions and refresh rates such as 4K 240Hz (tested with DisplayPort) - previously allowed only on Apple Silicon Macs. Tested in Monterey and Sequoia. Might work back to Catalina.

 

[Muscovite]

I have the Gigabyte RX 6800 XT from MacVidCards Europe in my mid-2010 5,1. If I install this card in slot 1, it only blocks slot 2, leaving slots 3&4 available. If I install this card in slot 2, it blocks slots 3&4, leaving only slot 1 available. It's a snug fit, but not difficult. Fan easily locks into place.
I cannot comment on flashing process.
Hope this is helpful to you.

Thanks for clarifying.

Gigabyte offers SIX different versions of the card with the same 6800XT:

AORUS Radeon™ RX 6800 XT MASTER TYPE C 16G
AORUS Radeon™ RX 6800 XT MASTER 16G
Radeon™ RX 6800 XT GAMING OC PRO 16G
Radeon™ RX 6800 XT GAMING OC 16G
Radeon™ RX 6800 XT GAMING 16G
Radeon™ RX 6800 XT 16G

Size-wise, only the bottom three are less than 300mm in length, so I assume you have one of those. Unfortunately, these early models are very hard to come by in Russia.

 

[flyproductions]

Size-wise, only the bottom three are less than 300mm in length,...

...and also i just like the physical (Founders Edition) appearance of the last one the most!

So sad, they will never run on anything past Monterey in the 5,1. 😥

 

[flyproductions]

Gentlemen, could you please kindly provide the exact make/models of the 6800XT and the 6900XT that you managed to physically squeeze into your cMP 5,1s length-wise,...

The Founders Edition Models even fit with an EVGA-Power-Link installed and Fan in the locked-position.

This is the Non-XT. But the XT should be the exact same length, only two and a half instead of two slot.

 

[MixMor]

Yes then you don’t need the pixlas mod if it’s the non xt. But still needs Syncretic’s patch

Done! All the steps you described and yes the latest AMDbflash with a GUI is the previous version, the 3.31. All done and running perfectly.
Thanks for you help!

 

[macsoundsolutions]

Done! All the steps you described and yes the latest AMDbflash with a GUI is the previous version, the 3.31. All done and running perfectly.
Thanks for you help!
View attachment 2436811 View attachment 2436821

Sweet!

 

[Hermesaudio]

Hello !
Just a newbie just kindly asking for (perhaps) a silly question...
Mac Pro late 2009. Single XEON CPU, 32GRam

In order to upgrade my actual GPU ATI Radeon 5870, I've bought a GYGABYTE Radeon RX6600XT. So I followed the described procedure to Patch the new GPU, using the generic FixRX6x00ROM_012. Once finalized all the process from a PC WIN11 i9/12900, and installed the new card on the Mac, the boot screen is OK, the password screen is OK (With my designed background), but when the all the boot and login process is finished, the background is WHITE. (I mean I can see the icons and bar and menus... but with a WHITE background). I can't change to an active "nature" background nor any picture but the "Solid Color" ones. Also the cursor do not moves soft and silk but jumping and freezing. Movies (even a short 1 minute .mov) are displayed same way jumping frames and freezing others.

Any suggestion?
What can be done i a wrong way?

Thanks and
PEACE from Barcelona