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2019 MacPro with 2 x AMD Radeon Pro Vega II Duo 32 GB

Forum|Forum|5 years ago
July 14, 2020
3 replies
3781 views

Hello,

I'm on a 2019 MacPro running 2 x AMD Radeon Pro Vega II Duo 32 GB GPUs. For some reason, when I'm running both modules, Photoshop doesn't allow me to access the Graphics Processor Settings. I'm also noticing a significant performance decrease and whenever I click out of PS the canvas turns grey.

When I remove the second module and just run a single AMD Radeon Pro Vega II Duo 32 GB, everything runs fine and I'm able to access the GPU settings.

I've contacted Adobe, Apple and AMD and haven't found a solution yet.

Any help with this issue would be greatly appreciated.

Thanks,

Anthony

This topic has been closed for replies.

Correct answer kined

OK thanks for that! Huge bummer to lose a $5200 graphics card to fix a
program bug. I did see on another forum (and confirmed that it works) that
PS 2020 (Release12.2.7) works with both cards installed.

Hello everyone, I had a solution, try to reconnect maint monitor where is your photoshop usually stay to another gpu, and that option appears to me! Sounds crazy but it helped for me!

best,

Ed

D

DERJUNG

Inspiring

I have found another way if it doesn't work with the monitor reconnection and Photoshop still denies GPU support:

Check if your Brush gets the red dot if you change the size, if and you only see an outline then:

1. disable GPU support under performance.
2. set the cache level to 6
3. disable native desktop under technology preview.
4. restart Photoshop

5. now enable GPU support again and set the cache stur back to 4 and enable native workspace under technology preview again click ok and restart Photoshop.

check now if you see the red dot while you change your brush size. It should work now.

This helped me when it didn't work with the monitor trick. I have 2 MPX modules (so then 4 Vega GPUs) and unfortunately Photoshop is always confused. Perhaps an option should be added in Photoshop that allows a specific GPU to be used for Photoshop. Since the automatic capture does not work 100%.

D Fosse

Community Expert

This is a variety of a much more common problem: dual GPUs in laptops. That also chokes Photoshop.

So this is a well known and very frequently reported problem. You'd think it should be a straightforward thing to tell Photoshop to use a specific GPU and ignore the others, but if it was, it would have been implemented long ago. So apparently it's not possible. Maybe the necessary APIs simply don't exist, whether in MacOS or Windows.

Adobe's official advice is to disable one GPU in computer management. That's workable with a laptop, but maybe not in your case.

Also, Apple is a somewhat "special case", because the driver is integrated into the OS, it's not a separate component. Normally, dual GPUs should work as long as they're run off the same identical driver. But who knows what happens under the covers in MacOS.

D

DERJUNG

Inspiring

Hi, thanks for your opinion on this.

I'll note that other software manufacturers also manage to make it work easily. And I can't disable a graphics card on the Mac Pro Mac OS like I can in Windows. It does not work. I can remove it. But why should I do that with a 4000 Euro graphics card? Indesign and Illustrator manage to pick a gpu and work. Only Photoshop ticks around. If it is really so difficult to install the function, Photoshop is not a professional tool but rather a chip shop around the corner. In any case, it once again does not work with the gpu support and I now do my work with affinity Photo. That works directly.
But I still can't accept that I paid for the subscription, have a pro work machine and use pro software and it doesn't work properly. This is simply not acceptable. It just upsets me. For example redshift render is able to manual select and deselect gpus in my system.
do take it Personal it is mean to adobe.

D Fosse

Community Expert

The thing about modern GPU processing is that it's not a simple one way flow, like it used to be.

Photoshop uses the GPU to perform actual data processing, and the result returned to Photoshop for further processing. It goes back and forth.

So you can see multi GPUs leading to confusion. Which one is receiving data, and which one returning it?

Z

zazziaAuthor

Participating Frequently

I appreciate your reply.

I understand where the confusion would come into play with PS trying to figure out which GPU to communicate with.

So when running two GPUs on MacOS, PS greys out the "Graphics Processor Settings" in preferences>performance. Does this indicate that PS doesn't recognize any GPUs at all or is that just confirming the communication issue between PS and the multiple GPUs? I'm asking because I also have a Windows machine with 2 Nvidia GPUs and PS doesn't grey out those preference settings. I find it odd that this only happens on MacOS.

Again, when running a single GPU on MacOS, that setting is available and everything runs perfectly fine.

Thanks again for your reply.

kined

Participant

Any updates on this? having the same issue ((

Ed

L

Lumigraphics

Legend

You may have to disable one, if not by removing it than in software.

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