![]() ![]() The processor maintains all software-visible state, but can take longer to wake up. C2 - Stop Clock: Core and bus clocks are off.Some processors also support an enhanced C1 state (C1E) for lower power consumption. The processor is not executing instructions, but can return to an executing state almost instantaneously. The CPU stays in deep C4 state longer, resulting in lower power consumption while idle. Deeper sleep comes from improvements in CPU and chipset interaction to redirect snoop cycles. C3 deep sleep and C4 deeper sleep are ACPI power management states. Power management is about improving battery life by putting the CPU to sleep when not in use. Deep sleep (C3) and deeper sleep (C4) are terms used to describe the power management of mobile platforms.
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