C State Name                      Purpose
C0      Operational status        The processor is working to its full potential
C1      Stop/Halt                 Stops the internal clocks of the processor, but the interfaces and APICs continue to function.
C1E     Improved stop             Stops all internal clocks of the software processor.
C2      Stop the clock            Stops the internal and external clocks of the CPU by hardware.
C2      Detention permit          Stops the internal and external clocks of the CPU by hardware. The interfaces and APICs continue to work.
C2E     Extended detention permit Stops the main clocks and also reduces the CPU voltage to reduce power consumption. Interfaces and APICs continue to work.
C3      Suspension                Stops all internal clocks of the CPU.
C3      AltVID                    Stops all internal clocks and lowers voltage.
C3      Deep suspension           Stops all internal and external clocks of the CPU.
C4      Deep suspension           Lowers the CPU voltage.
C4E/C5  Enhanced deep suspension  Lowers the voltage even further and turns off the memory cache.
C6      Deep shutdown             Reduces the CPU voltage to zero.
C7      Deep energy saving        The CPU flushes the L3 cache and cuts its power. The system agent power is also removed.
C7s                               Substate in which the L3 cache is flushed suddenly rather than in stages. I / O devices are put into energy saving.
C8                                The L3 cache is flushed and power to the PLL is removed.
C9                                The VCC input voltage is minimized.
C10                               The CPU shuts down completely.

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