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Below are a couple of images comparing quite a big discrepancy between GPU and CPU volumetric noise.
Same settings, much more noise on the GPU render!

Has anyone else experienced this?

The GPU must have a harder time clearing the noise for some reason at same Sample size..

GPU render

CPU render

The original images are on Google Drive.

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There are some differences between CPU and GPU rendered images. Some have been fixed in 2.78, some have not. Maybe later. You can do nothing about this. Only one recommendation: use what works better in your case and don't combine CPU and GPU rendering for animation. :-)

Blender 2.78 bugs fixes

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