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Currently I'm rendering on cpu, because at the time of writing it's faster for me (tested it a few times).
I know this is kind of bad and I should get a better gpu, but well, currently it's not possible to buy the 3080 that I want.

So I'm stuck with rendering on my Ryzen 9 5900X instead on my GTX 1060 (I know that this card is a bottleneck for me).

Also to notice, I'm pretty new to blender. But what I noticed while rendering on CPU is, that the Intel Denoiser is applied after a tile got rendered. But only with a single core.

Maybe this isn't such big of a problem when I render on GPU, because in the meantime the CPU can put all it's power into denoising.

But is there a way to let this run multithreadded?

For example my remaining render time at the beginning was 20min, and round about this time it was finished. But now it's denoising (40min in) and I would say it's just 2/3 finished. So it would totally take 60 instad of 20min for my render. Is it because I don't have an Intel CPU?

Maybe somebody could assist me with this.

Thank you very much

Here you can see that 23 threads are rendering the image and 1 thread (tile) is denoising. enter image description here

jona
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  • Which denoiser have you activated? (https://blender.stackexchange.com/questions/178257/type-of-denoiser-built-into-blender/178330#178330) You mentioned the "Intel denoise" but have a Ryzen CPU? The 'Intel OpenImageDenoise' requires an Intel CPU. When you enable denoise in the Cycles options then only 1 thread (tile) is used for denoising. When you have a Interl CPU then you can use the compositor node setup with the denoise node and the whole image is processed at once. – Blunder Jan 31 '21 at 20:31
  • I got the OpenImageDenoise activated. And I was wondering why it‘s working because yeah, it‘s not an Intel CPU. What should I use for good denoising with AMD? – jona Feb 01 '21 at 08:19
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    @Blunder OIDN doesn't require an Intel CPU. You can either use the denoise node or enable it in Render Properties > Sampling > Denoising > Render. – Robert Gützkow Feb 01 '21 at 17:40
  • @RobertGützkow I just enabled it where you said. Is that a disadvantage over the node? I tested it again today. After 30min the render was completed, time remaining was on 7min (didn't go down) and it took 45min more to denoise, because only one tile was used for denoising. – jona Feb 01 '21 at 19:18
  • @RobertGützkow oh, you're right. I confused it. The CPU must support SSE4.1, Ryzen CPUs do this. – Blunder Feb 01 '21 at 23:52
  • @jona try the node. On my PC it's a bit faster than the render setting. I'm surprised that denoise takes so long for you. My render times are several minutes but denoise takes only a few seconds. Maybe my scenes are too simple? I'll try one of the official demo files. – Blunder Feb 02 '21 at 00:07
  • I didn't notice a significant slow down with denoising either and I didn't notice a trailing single tile that would denoise in current versions of Blender. – Robert Gützkow Feb 02 '21 at 08:26
  • Well, yeah yesterday I tried with official files and had no slowdown there. Can I upload my file here so you can check it maybe? I can upload later after work. – jona Feb 02 '21 at 12:56
  • I posted another question here with the file I'm talking about attached to. https://blender.stackexchange.com/questions/210383/speed-up-my-rendertimes-in-cycles – jona Feb 02 '21 at 17:21

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