P: Computer crashes/Shuts down while using Denoise

The first time I tried to use Denoise AI the Mac Pro fans started to roar about 1/3 of the way through processing the DNG and the Mac did a hard shut down. This has not happened to me in 30 years. Only other programs open were Photoshop, Apple Music, Mac Mail. I tried various combinations in Preferences > Performance > Use Graphics Processor, including Auto, Custom and Turning Off the graphics processor but every time the fans began to roar and I stopped Denoise, not wanting to risk multiple hard shut downs.

OSX 12.6.5

2019 Mac Pro with 192 GB 2666 MHz DDR4

AMD Radeon Pro 580X 8 GB

3.5 GHz 8-Core Intel Xeon W

Please see the solution provided in this linked thread https://community.adobe.com/t5/lightroom-classic-discussions/major-hardware-crash-attempting-to-use-lightroom-classic-12-3-denoise/m-p/13742331

Hi There,

I'm using Photoshop and I'm having the exact same issue in ACR. Changing between Auto and Custom hasn't made any difference.

And I had 50GB cache and have increased it to 150GB without the slightest difference.

It certainly is GPU intensive, pushing my AMD WX7100 to 97-100% usage within seconds and keeps it at that level throughout. On average I can process one image without it crashing, but even processing one and then another as a single process, not as a batch and the system rolls over and shuts down. It is always at about 90 -100% processed and even just finished when it goes down.

When AI Denoise does complete the process it takes under 60 seconds to do so, whereas when Adobe processed an identical image which they had requested for testing it took their machine a good 10 minutes. One of their suggestions was that due to the speed at which my system was processing the image the GPU couldn't cope. Yet this was despite my system CPU registering only 0% usage and 3% memory usage. One thing I have noticed is that the more intense the cleaning required, the more likely it is too crash, though I have had a few crashes when it has been mild. It has also been suggested by Adobe that it is hardware at the OS level, but considering how little the system is actually even being used, let alone pushed at that level it seems very unlikely.

My system consists of: AMD Ryzan 9 7950x, ASUS motherboard ROG Crosshair Extreme x670e, 64GB Corsair DDR5 5600 Ram and as mentioned above AMD WX7100 GPU with 8GB DDR5 ram.

If GPU's are going to require more Ram to run ACR, assuming that it is a case on my part of running out of Ram, then it's going to become extremely costly to purchase a GPU with sufficent Ram. And as I run 4 monitors, I'm looking somewhere in the region of $2,500.00 USD which would be for the soon to be released AMD Radeon Pro W7000 Series W7800 which has 32GB DDR6 ECC Memory the W7900 their flagship is even more expensive and has 48GB DDR6. I guess that's the price of progress.

Yes it happened to my PC. IMac 2012 running windows 10. It can't boot up anymore! 

Thank you for the guidance - I changed the CR GPU from Auto to custom - and increased the CR Cache to 15GB - so far I have tested a few photos - fingers crossed it's working so far. I shall post again if the computer shuts down on using denoise again. 

In my short experience experimenting with both different Mac and Windows machines, the new AI Denoise relies heavily on the GPU (graphics card). Pretty soon camera raw is going to rely almost exclusively on the GPU to edit photos, so if your gpu and or drivers are not up to the task or flawed in some way that could cause a system crash.

If in photoshop you go to Photoshop>Preferences>Camera Raw>Performance, what does it show about your graphics processor?

No such issues on this end.

You can try disabling GPU in preferences, any better?