Can your CPU and GPU render different scenes at the same time? Ex. Can a CPU(3900x) render an image of a car, while your GPU(3070) renders a house in a separate blender scene? Well it probably can if you have 2 windows open, but will it be much slower than if you waited and rendered each scene one after another?
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1$\begingroup$ Can you? Yes. Shoud you? Probably not. Sounds like you already answered your own question. See blender.stackexchange.com/questions/62930 $\endgroup$ – Duarte Farrajota Ramos♦ Dec 12 '20 at 22:20
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1$\begingroup$ Keep in mind that GPU rendering does not mean that the CPU is idle. Not all operations are carried out by the GPU. $\endgroup$ – susu Dec 13 '20 at 5:05