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Hi there,
At this moment in time, Vizard R3 does not support multiple GPUs, so a single Vizard instance can access only one video card at a time. If the video cards are in an SLI configuration, they will appear as a single logical GPU, and will work with Vizard. If you have a QuadroPlex, you can use what is called SLI Mosaic mode to create a single logical GPU as well. But it doesn't sound like you are running this configuration. However, if you are running a configuration like this then I can prepare a template for you.
At this time, the preferred solution is to have a machine for each video card, and then run a cluster to sync them all together. You cannot run a cluster of multiple Vizard applications running on a single machine. Multi-GPU is something we are planning for in Vizard R4, which is under development.
regards,
Wayne
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