Use both spatial and temporal sample count, and turn off path tracing denoiser in the post process.
Then if you want 1000 samples use both 32 spatial and 32 temporal samples (32*32=1024), it should do the trick. Increase the amount until you are happy with the result. You also can use Davinci Resolve to remove any noise that might appear since we disabled the denoiser, and in that case, it’s better to render 4-8 shots to use temporal denoiser.
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