The read-only Local GPU field displays the graphics card installed locally, if there is one available. You can toggle the GPU on and off using the Use GPU if available control. If you have multiple GPUs available, select the required device using the Preferences > Performance > Hardware > default blink device dropdown.
NOTE: Selecting a different GPU requires you to restart Nuke before the change takes effect.
TIP: Even if there is no GPU available locally, you can still enable Use GPU if available. BlinkScript then uses the GPU as and when one becomes available.
You should also enable this if you wish to render from the command line with the --gpu option.
The output between the GPU and CPU is identical on NVIDIA GPUs, but using the GPU can significantly improve processing performance.
NOTE: If your computer enters sleep mode, the CUDA drivers cannot recover and you must restart Nuke to use GPU acceleration.
In Nuke 9.0, we added support for AMD GPUs on late 2013 Mac Pro 6.1, running OS X 10.9.3 'Mavericks', or later. While, in some cases the bit-wise equality between GPU and CPU holds, for some operations there are limitations to the accuracy possible with this configuration.
Running Nuke on late 2013 Mac Pro 6.1, running OS X 10.9.3 'Mavericks', or later, adds an additional control allowing you enable multi-GPU processing. The option is global, applying to all GPU accelerated nodes, and is enabled in the Preferences > Performance > Hardware tab under GPU.
NOTE: The multi-GPU preference is only displayed if you're using Nuke on late 2013 Mac Pro 6.1, running OS X 10.9.3 'Mavericks', or later. See Requirements for GPU Acceleration for more information on use.
Additionally, enable Vectorize on CPU to use SIMD acceleration on the CPU where possible. See Help > Documentation for more information on kernel execution.
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