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

[macsoundsolutions]

QUESTION? The Sapphire Nitro+ RX6600XT I flashed has a BIOS Switch! What does this mean? I flashed it in the quiet position not the performance, does this mean when it is switched to performance it won't boot in the 5,1 should I have had it in the performance position before starting the process? It seems the gains are pretty minimal. Or will it work in both positions after flashing.

 

[NicoFR75]

QUESTION? The Sapphire Nitro+ RX6600XT I flashed has a BIOS Switch! What does this mean? I flashed it in the quiet position not the performance, does this mean when it is switched to performance it won't boot in the 5,1 should I have had it in the performance position before starting the process? It seems the gains are pretty minimal. Or will it work in both positions after flashing.

It’s a three positions switch.
When holding the card with the bracket on the right :
- On right position, the VBios is selected according to the configuration you set in the Trixx App from Sapphire (windows only). On the first boot, the performance VBios is selected.
- On the middle position, the quiet VBios is selected.
- On the left position, the performance VBios is selected.

If you flashed the quiet VBios, then you should leave the switch on the middle position. Setting it on right or left would selected the performance bios and you won’t be able to boot.

On mine I extracted and flashed the two BIOS.

Honestly i didn’t hear any change between quiet and performance VBios.

 

[xthunder]

RX 6600/6600M/6600 XT/Radeon Pro W6600 support starts with Monterey 12.1.

https://forums.macrumors.com/threads/amd-polaris-vega-navi-gpu-macos-support.2083168/post-30536959

After upgrading to Monterey(12.4), my ASRock Challenger D Radeon RX 6600 XT 8GB is recognized now!

Straight Martion Lo 0.8.0!

This is Great!!! Thanks!!!

 

[macsoundsolutions]

It’s a three positions switch.
When holding the card with the bracket on the right :
- On right position, the VBios is selected according to the configuration you set in the Trixx App from Sapphire (windows only). On the first boot, the performance VBios is selected.
- On the middle position, the quiet VBios is selected.
- On the left position, the performance VBios is selected.

If you flashed the quiet VBios, then you should leave the switch on the middle position. Setting it on right or left would selected the performance bios and you won’t be able to boot.

On mine I extracted and flashed the two BIOS.

Honestly i didn’t hear any change between quiet and performance VBios.

EDITED THIS AGAIN sorry! and thanks for the help NicoFR75.
So it turns out I flashed it in performance mode / software mode with the switch in position 3. I put the switch in position 1 and it boots fine and boots in position 3, then I put it in position 2 and it would not boot. So there you have it, you must flash it twice like you did if you want to be able to use it in silent mode.

 

[ssj92]

Can someone tell me which amdvbflash version they are using to flash the rx 6000series?

I got the latest one from techpowerup but am getting a "error reading from ROM" message.

Nvm put in different computer and flashed successfully.

 

[startergo]

Can someone tell me which amdvbflash version they are using to flash the rx 6000series?

I got the latest one from techpowerup but am getting a "error reading from ROM" message.

Nvm put in different computer and flashed successfully.

That may happen if you have MVC flashed card alongside which is read protected.

 

[ssj92]

That may happen if you have MVC flashed card alongside which is read protected.

I was trying to flash using a external pcie enclosure for my laptop. Switched to desktop and it worked fine.

 

[macsoundsolutions]

I made a little video on the process. Thanks to @Syncretic

 

[Norbert Mikołajczyk]

Reference 6900xt success! cmp is still kicking!
Upgrade from Radeon viI was well worth it.
blender gpu rendering is ~3x faster
god of war 1440p high/ultra settings 60-110fps
Dying light 2 1440p highest settings (raytracing turned off) 100-110fps
99% gpu utilization in those games
Unigine Heaven 1440p Extreme 3768 points, 303fps max

sleep works without spinning fans like with RVII
no fan mode works
gpu is so much quieter than rvii
only downside: one extra pci slot lost

thank you so much @Syncretic for your brilliant work!

 

[Exit_74]

Reference 6900xt success! cmp is still kicking!
Upgrade from Radeon viI was well worth it.
blender gpu rendering is ~3x faster
god of war 1440p high/ultra settings 60-110fps
Dying light 2 1440p highest settings (raytracing turned off) 100-110fps
99% gpu utilization in those games
Unigine Heaven 1440p Extreme 3768 points, 303fps max

sleep works without spinning fans like with RVII
no fan mode works
gpu is so much quieter than rvii
only downside: one extra pci slot lost

thank you so much @Syncretic for your brilliant work!

Nice, can you make a video of this for YT? Would love to see it..cMP is still a beast

 

[macsoundsolutions]

Reference 6900xt success! cmp is still kicking!
Upgrade from Radeon viI was well worth it.
blender gpu rendering is ~3x faster
god of war 1440p high/ultra settings 60-110fps
Dying light 2 1440p highest settings (raytracing turned off) 100-110fps
99% gpu utilization in those games
Unigine Heaven 1440p Extreme 3768 points, 303fps max

sleep works without spinning fans like with RVII
no fan mode works
gpu is so much quieter than rvii
only downside: one extra pci slot lost

thank you so much @Syncretic for your brilliant work!

Does your card have three 8 pin, how are you powering it?

 

[prefuse07]

Does your card have three 8 pin, how are you powering it?

The reference 6900XT uses 2x8pin

Nice, can you make a video of this for YT? Would love to see it..cMP is still a beast

It IS a beast indeed!

 

[Norbert Mikołajczyk]

Does your card have three 8 pin, how are you powering it?

it's 2x8pins with pixlas mod

 

[Stex]

I installed the Radeon Pro W6600 in my cMP. I successfully patched the ROM with @Syncretic tool (thanks!). I have benchmarks that I will share here in the next days, I am still testing the card at this time. In the meantime, I have 2 questions, maybe some of you can provide guidance:

1) the W6600 uses one 6pin power connector. So far I have it connected to only one of the two mini 6pin connectors on the back plane. GPU works well. My assumption is that the combination of 75W from the back plane and the 75W from PCIe should be sufficient to power the card (AMD states that it peaks at 130W.) let me know if I should consider using both mini 6pin on backplane With an adapter to single 6pin.

2) this is a single slot GPU with low power requirement. Which is great and mostly the main reason why I purchased it. But its small fan is quite loud and produces a constant high pitch noise, and it does not appear to decrease rpm when temps drop. I am still trying to understand whether this is the way it is/works with Pro line GPUs or whether this is an issue with the current AMD driver for macOS. If you happen to own this card and can provide some feedback I would appreciate. As far as I know AMD does not provide an app to change fan curves on macOS, if you know of an alternative app/hack that would let us change the GPU fan curve please share as I would be interested to try.

 

[startergo]

My assumption is that the combination of 75W from the back plane and the 75W from PCIe should be sufficient to power the card (AMD states that it peaks at 130W.)

You are correct.

 

[Stex]

You are correct.

Thanks. Any thoughts on the fan noise and any way to adjust fan curve? I know you have yours installed in a hackintosh and not on a cMP. My RX 5700 is much quieter in comparison.

 

[startergo]

Any thoughts on the fan noise

No fan noise for me. As far as the fan curve that is inside the vbios or can be adjusted in Windows:

It could be possible to adjust the power table, but maybe @h9826790 can give you a hint.
You can create an SSDT with power table changes:

[TOOL] Radeon VII PowerPlay Table Generator (OC, UV, Fan Curve)

Since apparently there is quite a big demand for it, I am now starting an official topic for my Radeon VII PowerPlay Table generator for macOS. It's a simple Excel spreadsheet where you can change the settings to your desired values. The result is a PowerPlay Table you can inject via Clover on yo...

www.insanelymac.com

 

[prefuse07]

2) this is a single slot GPU with low power requirement. Which is great and mostly the main reason why I purchased it. But its small fan is quite loud and produces a constant high pitch noise, and it does not appear to decrease rpm when temps drop. I am still trying to understand whether this is the way it is/works with Pro line GPUs or whether this is an issue with the current AMD driver for macOS. If you happen to own this card and can provide some feedback I would appreciate. As far as I know AMD does not provide an app to change fan curves on macOS, if you know of an alternative app/hack that would let us change the GPU fan curve please share as I would be interested to try.

FWIW -- the Sapphire Pulse RX-5700XT I had in my machine also had a VERY high sounding fan when engaged, it sounded absolutely horrifying, and pissed me off so much when it was on, that I was more than glad to have been able to get rid of it and upgrade to the (silent) RX-6800XT. Hell, even my RX-580 sounded better....

*shrug

 

[Exit_74]

Whats the difference between roms, the ones that mr @Syncretic has done (fantastic work!) and the ones that have a native bootscreen is that a piece of code Apple adds themselves? I try too understand that if i patch the rom it will boot in a cMP and only have a bootscreen when using opencore?

 

[Stex]

As far as the fan curve that is inside the vbios or can be adjusted in Windows:

When using the Radeon Pro app for fan control on Windows, any changes made only apply on Windows, correct? Or are they injected into the card ROM somehow and would still be set in macOS? I understand that on Windows we have a lot more control over GPUs via manufacturers apps, was hoping for something similar in macOS.

The other option you suggest (power table) could be an alternative.

 

[EvilMonk]

Great news, flashed my card and worked for my RX 6600 fighter Powercolor 8Gb with my Mac Pro dual x5690 both in the Mac Pro and as eGPU 👍🙌

 

[startergo]

When using the Radeon Pro app for fan control on Windows, any changes made only apply on Windows, correct?

Not sure, but I think they are Windows only related.

 

[prefuse07]

When using the Radeon Pro app for fan control on Windows, any changes made only apply on Windows, correct? Or are they injected into the card ROM somehow and would still be set in macOS? I understand that on Windows we have a lot more control over GPUs via manufacturers apps, was hoping for something similar in macOS.

The other option you suggest (power table) could be an alternative.

Yeah, i'm 99% sure it only has effect within Windows

 

[aconu]

Hello,

Just to share some results regarding a RX 6900 XT Reference Design in a MP 5.1 2010 2x3.46, freshly flashed with Syncretic patch :

Incredible results for such an old computer !

Of course Pixlas mod mandatory.

Just one drawback, it seems the card do not POST anymore on a recent UEFI PC, but absolutley no issues to boot with Open Core to macOS or Windows.

Again, many thanks to Syncretic for this small miracle (I really though my Mac Pro was at the end of the road with the RX 5700 XT).

 

[Norbert Mikołajczyk]

Hello,

Just to share some results regarding a RX 6900 XT Reference Design in a MP 5.1 2010 2x3.46, freshly flashed with Syncretic patch :

View attachment 2009122
View attachment 2009123
View attachment 2009124

Incredible results for such an old computer !

Of course Pixlas mod mandatory.

Just one drawback, it seems the card do not POST anymore on a recent UEFI PC, but absolutley no issues to boot with Open Core to macOS or Windows.

Again, many thanks to Syncretic for this small miracle (I really though my Mac Pro was at the end of the road with the RX 5700 XT).

That's really worrying that it no longer POST on a UEFI PCs...
So I'm assuming that to run on modern UEFI PCs we need to revert the flash back with the BIOS PC or with our cMP?