Which ACPI power state provides power to the CPU and RAM, but powers down unused devices?

Last Updated: Dec 30, 2022
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Which ACPI power state provides power to the CPU and RAM, but powers down unused devices?

  • S3
  • S4
  • S1
  • S0
  • S2

Explanation: The Advanced Configuration and Power Interface (ACPI) standard provides support for power states that are very important to mobile devices such as laptops.

  • S0 – The computer is on and CPU running.
  • S1 – CPU and RAM have power, but unused devices are powered down.
  • S2 – CPU is off; RAM is refreshed.
  • S3 – CPU is off; RAM is set to a slow refresh rate.
  • S4 – CPU and RAM are off (and RAM contents saved to a temp file).
  • S5 – The computer is off.

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