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Is Arnold only read Nvidia GPU to use for render? I cannot see CPU/GPU option on my Arnold render system. I am actually using Sapphire RX 580 graphics card. On my render setting it's showing these options (Interactive/Export Ass/Export Ass and Kick) and i cant find the CPU/GPU options.
You can select CPU or GPU in Render Settings > System > Device Selection.
Please also read this.
Arnold GPU requires an NVidia GPU, that's why you don't see any GPU option in the render settings.