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GPU rendering causing artifacts, aka darker areas (R9 270x - Blender 2.7a) - Technical Support - Blender Artists Community
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Why is Blender using CPU instead of GPU even though I have set Optix/Nvidia Geforce as Cycle render device? (and how to fix it) : r/blenderhelp
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rendering - Blender 2.8 uses CPU rather than GPU, contradicting with settings - Blender Stack Exchange
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