You could have 2 instances blender open and set one to cpu and the other to gpu. By turning on placeholder under the render tab you can in theory have both devices rendering the same scene at the same time.
Also know, can Blender use CPU and GPU at the same time?
Blender is able to use your computer’s central processing unit (CPU) or graphics card (GPU)—or both—for rendering. To eliminate render wait times, you might consider investing in multi-core processors and GPUs with a high CUDA core count.
GPUs are vital for 3D rendering, and should be one of your biggest priorities. If you don’t have a graphics card, you probably won’t get very far. There are a few different ways to evaluate graphics cards, but one of the industry standards is currently the NVIDIA GTX series.
Then, does Blender use CUDA?
With CUDA and OptiX devices, if the GPU memory is full Blender will automatically try to use system memory. This has a performance impact, but will usually still result in a faster render than using CPU rendering.
Does CPU matter for rendering?
Precise performance. The biggest reason why CPU is the standard in 3D rendering is simply that it has far greater overall quality than GPU. If you want your renders to be precise and your output quality to have the highest standards, then CPU rendering is the best choice.
Is CPU important for rendering?
Rendering absolutely hammers the processor so the CPU is arguably the most important component when choosing rendering hardware. Each CPU features multiple processors (called cores). The more cores you have, the faster the render. As a rule of thumb, doubling the number of cores halves the rendering time.
Is rendering GPU or CPU intensive?
Though it might take hours (maybe even days) to finish rendering an image, traditional CPU-based rendering is more likely to deliver higher image quality and much clearer images that are devoid of noise. A GPU has many more cores than a CPU, but overall, each core runs slower compared to a CPU core.