The downside is your CPU will be locked up during rendering, which for me is a big pain. If your GPU is really slow then maybe you'll want to enable the CPU, depending on your CPU and how powerful it is. Personally, I never use CPU rendering because my GPU renders immensely faster than even my 8 core, 16 thread CPU.
Yeah, usually if you tick both they will both render simultaneously. It is a small scene with one character, so it fits into VRAM (2GB of 4GB are used). Is this the way it should be? What is the CPU doing when the GPU renders? I thought Iray renders with GPU only? Should I disable the CPU in the render settings? When I render the scene my GTX 970 is working (according to the sensors in GPU-Z), but I also have a CPU load of 99%. In the advanced render settings both, the CPU and the GPU are enabled (ticked). Now I have set up a small test scene in DAZ Studio. Finally I have got a brand new MSI GTX 970 (4GB)!
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