I'm not an expert, but I'd guess the amount of power needed to keep the GPU part of the SoC constantly powered up is greater than the extra amount needed to keep the CPU at a higher power level to handle rendering in software. At least in the common desktop cases where the stuff being drawn is fairly simple.The CPU still has to create the graphical output (the contents to show), so I doubt it'll remove a lot of stress from the CPU.But it should also mean the graphical work the cpu is not doing is done by the gpu more efficiently, so gpu can have much lower clock while only displaying 2D stuff, and the CPU can be lower frequency/cores as well. won't that save in the power?
I'm just thinking portable devices such as android phones and tablets are drawing in 3D surfaces the whole time and still get decent if not excellent battery life.
AFAIK, X only updates the areas that change graphically, so the on normal usage, the CPU doesn't have much to do.
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