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  • NVIDIA – The CUDA engine is supported only in 64-bit builds of V-Ray for Maxwell-, Pascal-, Turing-, Volta-, or Ampere-based NVIDIA cards. Rendering on multiple GPUs is also supported. See here if your card has the minimum required compute capability.
  • NVIDIA RTX – Choosing RTX GPU mode works with RTX RTX cards.
  • Hybrid Rendering (running CUDA on GPU and CPU): Starting with V-Ray 3.6, V-Ray GPU CUDA rendering can be performed on CPUs and NVIDIA GPUs at the same time. Using the Select Devices for V-Ray GPU Rendering you can enable your CPUs as CUDA devices and allow the CUDA code to combine your CPUs and GPUs to utilize all available resources.

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If V-Ray GPU cannot find a supported CUDA device on the system, it silently falls back to CPU code. If V-Ray GPU cannot find a supported RTX device on the system, the process stops.

To see if the V-Ray render server is really rendering on the GPU, check out its console output.

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Тo use NVLINK on supported hardware, NVLINK devices must be set to TCC mode. This is recommended for Pascal, Volta and Turning-based Quadro models. For GeForce RTX cards, a SLI setup is sufficient. Also note that to prevent performance loss, not all data is shared between devices.

For more information, see the OptiX and NVLink FAQ page.

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