Does CUDA matter for Blender performance?
What about CUDA and Cycles performance?
What about CUDA and Eevee performance?
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Cuda and Optix are both Nvidia exclusive technologies and for the purpose of doing rendering in blender are generally faster than AMD cards using OpenCL technology (though this is largely to do moreso with the monopoly Nvidia has and them not playing nice with AMD rather than their cards inherently being better.) But yes, they are important. If you have a dedicated Nvidia GPU, you will care a lot about Cuda.