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Depends on the architecture. Actually, AMD Radeon GPUs are very good at multitasking, and that is the reason for their intensive use in the second phase of Bitcoin mining. NVIDIA might not be that strong at multitasking, but they might solve efficiently more complex problems.

Yes, the second picture is commonly used by NVIDIA for promoting their self driving technologies. I also seen it in many articles about AI in autonomous driving.

By multitasking I not meant only performing two tasks at once, but performing normal tasks at speed unaffected by low priority (boinc) work. NVIDIA drivers totally ignore process priority and give out most resources to boinc, because it's apps take what they can.
Radeon drivers at least do not lag desktop, but still reduce game FPS with background boinc work.

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