For a noise-free render, lower the threshold value, maybe even as far as 0.010. Set the Adaptive Threshold to something like 0.015 or 0.02.A large max samples means that the quality is controlled by the noise falling under the threshold, instead of by clamping to the max AA. In general, the max samples should be a large value. Camera (AA) in the range of 30 to 50 (depending on the scene, you might go closer to 100). We recommend you also use Adaptive sampling. Matching noise can take a little experimentation because Arnold GPU uses Camera (AA) sampling only. You can easily switch between CPU and GPU with a single click in the System render settings. The cache only needs to be re-populated after installing a new Arnold version, updating to a new NVIDIA driver, or changing the hardware configuration of GPUs on the system. Note that pre-populating the cache can take up to 15 minutes. To avoid the one-time delay, we recommend that you run Pre-Populate GPU Cache before you do any renders. This can delay the time to the first pixel for your first render. The very first time you render with the GPU, the GPU renderer has to create a cache of shaders. NVIDIA Driver Downloads Pre-populating the GPU cache Windows GeForce: 472.12 or higher, Quadro: 472.12 or higher.
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