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When rendering in Cycles at 1080p, everything went fine until it started denoising. I then suddenly got the error: CUDA error: Out of memory in mem_alloc_result, line 815.

My GPU has 6GB VRAM and my computer has 24GB RAM, yet neither showed any signs of approaching the max.

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    $\begingroup$ The denoiser uses a lot of memory. Why does denoising take up so much memory? $\endgroup$ – susu Jun 23 '20 at 1:03
  • $\begingroup$ I had to switch my viewport shading from rendered to solid to fix this. $\endgroup$ – Joe Apr 9 at 19:03
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Denoising the entire 1920x1080 image at once caused the out-of-memory issue. Disabling Progressive Refine and making the tile size reduced the number of pixels denoised at once, eliminating the issue.

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