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When rendering from the command-line in Maya (using Render), 3ds Max (using 3dsMaxCmd.exe) or Softimage (using xsibatch.exe) with Redshift, you can specify the GPU devices to use for the rendering job. When specifying the GPU devices from the command-line, the Redshift preferences.xml file is not updated, so running Maya, 3ds Max or Softimage in interactive mode will still use the GPU devices that you specified in the System tab of the Redshift render options.

Several render managers including Deadline and Royal Render natively support GPU selection when rendering with Redshift. Selecting only a subset of available GPUs for a job is useful for example to render multiple frames simultaneously on a single machine for optimal scaling.

How do I determine my GPU device ids?

There are a number of ways to determine the device ids associated with each of your GPUs.

One option is to open prefences.xml from C:\ProgramData\Redshift in a text editor and inspect the value of "AllCudaDevices". For example:

<preference name="AllCudaDevices" type="string" value="0:Quadro K5000,1:Quadro 6000," />

In this case the Quadro K5000 is device 0, while the Quadro 6000 is device 1.