Very slow rendering on RTX 3080!

[Насвай]

At times while working in the blender program, I encounter absurdly long render times for one frame: https://i.imgur.com/oB4BJ5L.png (shreenshot).

I ran render tests on different driver versions (527.56, 522.30, 526.86, 497.29). In all versions of the drivers, after some time, performance dropped hundreds of times, except for driver 497.29. It works stably. Also tests were carried out on blender versions 3.3, 3.4, 3.4.1.

It would seem that the problem is solved, you can simply install the 497.29 driver and work stably on it, but this is not so. Only blender works on this driver version, other programs crash and require drivers of at least 520.

I have a friend with an rtx 3080 graphics card from a different vendor. He states that he has a similar problem.

Please help me, I'm already in despair and don't know what to do(

[butcho]

Mmmh, must be something related to either your pc or the 3080 series maybe. I use a 2070 Super, a GTX 1070 and an nvidia Quadro RTX 5000 for my render jobs. All with the latest drivers and I never had such a problem. Would be interesting if other users using the 3080 series encounter the same problem.

You sure you've switched to GPU for rendering? I got render times like that when I use my old Intel quad core for rendering. ^^

[Насвай]

Originally posted by butcho:

Mmmh, must be something related to either your pc or the 3080 series maybe. I use a 2070 Super, a GTX 1070 and an nvidia Quadro RTX 5000 for my render jobs. All with the latest drivers and I never had such a problem. Would be interesting if other users using the 3080 series encounter the same problem.

You sure you've switched to GPU for rendering? I got render times like that when I use my old Intel quad core for rendering. ^^

Unfortunately no. The render is on the video card. I installed the 497.29 driver again and the render time is basically 30 minutes (instead of 43 hours on the new drivers) https://i.imgur.com/xIhNM9R.png

Regardless of the driver version, the video card is always loaded at 100%

[Squaakz]

Same here, not exactly sure when problem started but struggling with same thing.
Also Blender always goes unresponsive for a while when I save the project
It's very unstable for me at the moment

[V I D A L]

I know you already confirmed it, but I have to ask again. Are you really sure you are doing GPU Compute instead of CPU?
Try selecting OptiX in System preference and make sure to confirm your GPU is checked.
Uncheck CPU just to be absolutely sure you are fully using your GPU.

[Насвай]

Originally posted by V I D A L:

I know you already confirmed it, but I have to ask again. Are you really sure you are doing GPU Compute instead of CPU?
Try selecting OptiX in System preference and make sure to confirm your GPU is checked.
Uncheck CPU just to be absolutely sure you are fully using your GPU.

Yes, I am absolutely sure that the rendering goes to the GPU. And judging by the H / W monitoring, the video card is loaded at 100%

[Насвай]

Originally posted by V I D A L:

I know you already confirmed it, but I have to ask again. Are you really sure you are doing GPU Compute instead of CPU?
Try selecting OptiX in System preference and make sure to confirm your GPU is checked.
Uncheck CPU just to be absolutely sure you are fully using your GPU.

Right now I'm testing blender 3.3.1 on driver 527.56. I can assume that if you use this version and if you do not save the user settings, then the video card will start to work stably during rendering. But maybe I just got lucky. I will test further.
If you know more about this issue, please send your report to the blender developers (https://developer.blender.org/)!

[Насвай]

Sorry, I was wrong. I did the same tricks I described above and again the video card stopped rendering

[The Renderer]

How much RAM does your card have? Maybe Blender is running out and using the slower system memory.
Or your card overheats and is throttled (unlikely, but who knows).
Try rendering the default scene with a massive sample size (so it runs for a while) and see what happens.

[Насвай]

Originally posted by The Renderer:

How much RAM does your card have? Maybe Blender is running out and using the slower system memory.
Or your card overheats and is throttled (unlikely, but who knows).
Try rendering the default scene with a massive sample size (so it runs for a while) and see what happens.

GPU MEM - 10gb. Render can't start if it doesn't have enough video memory
Graphics card stays within 70 degrees and never overheats
I've done some testing and may have found what's wrong. I made a scene with several cubes, a volume and a strong light source, and also set a large sample size.
Results:
497.29 driver - 4 minutes 12 seconds (806 MB of video memory used)
527.56 driver - 3 minutes 45 seconds (806 MB of video memory used)
At the same time, the viewport works quickly and responsively in the cycles render mode. Just like I planned
I also ran a test with a complex scene and then everything got much worse:
497.29 driver - 22 minutes 51 seconds (8775 MB VRAM used)
527.56 driver - 35 minutes 37 seconds (8775 MB of video memory used)
The viewport is quite buggy and poorly responsive in both versions of the drivers (but this is logical since the scene is complex). In the viewport, the view mode in cycles on the 497.29 driver works as expected - it gradually develops the picture. On the 527.56 driver, cycles almost doesn't work in the cycles view mode (more precisely, it works, but it's even slower than my four-core processor).
In render mode 527.56 the driver is unstable. I had to wait 11 minutes for the first sample to load. And I'm still lucky. Sometimes the render time can be 44 hours for a single frame (see screenshot in the question)

As a result, we can come to the conclusion that with the new drivers, the blender is unstable when the video memory is almost completely loaded.

I recorded the workflow of all tests on video in an accelerated version: https://drive.google.com/drive/folders/1_oMmj90PLXiojBbORk8W1ynpdzITi6gJ?usp=share_link . I advise you to download the video to your computer so that it does not compress when viewed through Google Drive ...

[The Renderer]

I suggest posting your findings on Blender.org as potential bug, there is nothing we can do about it here and Blender Devs don't read the Steam forums as far as I know.

[Crow]

Are you sure you enabled CUDA in the options? You will find it in edit, preferences, then System. If it's enabled then maybe your power supply isn't powerful enough to run your graphics card. I got a 3070ti and it works perfectly.

EDIT: Ok, so you aren't a beginner I checked your profile. So then maybe power supply? Might be your scene that is causing issues. Import everything into a new scene and try it again. In my case lately I've experienced a lot of crashes.

[Насвай]

I have a powerful power supply (1000 watts). And I highly doubt that this is the case. I'm still leaning towards the fact that this is most likely a problem with the driver and the blender itself.
I turned to the developers of the program (https://developer.blender.org/T103450) for help, but that didn't help either.
The only solution is to use driver 497.29 while working in blender. After the work is completed, install the latest version of the drivers back

[ins1der]

Hi. I have the same problem on a 3060ti. Did you find any fix besides changing drivers?

[Насвай]

Hi. Unfortunately I didn't find

[ZergSquad]

тупой вопрос, ты не пробовал в настройках блендера вырубить вообще гпу, перезапустить прогу и обратно врубить cuda/optix, а потом в сцене тыкнуть на cpu и обратно ?