how do processor c-state save energy?
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Each CPU has several power modes and they are collectively called "C-states" or "C-modes". ... The more units you stop (by cutting the clock), reduce the voltage or even completely shut down, the more energy you save, but more time is required for the CPU to "wake up" and again be 100% operational.
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The basic idea of these modes is to cut the clock signal and power from idle units inside the CPU. The more units you stop (by cutting the clock), reduce the voltage or even completely shut down, more energy you save, but more time is required for the CPU to “wake up” and be again 100% operational.
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