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You can set V-Ray GPU as production renderer by the V-Ray Renderer node's parameters (Export tab > Mode).
By default, the V-Ray IPR node will use the settings from the V-Ray Renderer node. The main differences are that the IPR mode is interactive and the Production Rendering Mode is not. Production rendering allows you to render animations, and V-Ray will calculate and use Light Cache for GPU GI calculations if it has been set as secondary GI engine. For IPR, V-Ray GPU always uses Brute Force for both primary and secondary GI engine, unless Light Cache is used from file.
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