Whilst browsing the interwebs, I found an article here about how to run a Power Efficiency Report. As I wasnt doing anything, I decided to try it and see what it did.
In the results it listed the following four sleep states with true of false next to them showing if my PC supports it;
- S1
- S2
- S3
- S4
I just wondered, what are the differences between these sleep states?
Thanks
Answer
S0 - On / Working
The computer is powered up. If supported, power conservation is handled by each device.
S1 - Sleep
CPU is stopped. RAM maintains power. Everything else is off, or in low power mode.
S2 - Sleep
CPU has no power. RAM maintains power. Everything else is off, or in low power mode.
S3 - Standby
CPU has no power. RAM maintains power, refreshes slowly. Power supply reduces power. This level might be referred to as “Save to RAM.” Windows enters this level when in standby.
S4 - Hibernate
Power to most hardware is shut off. Any files in memory are saved to the hard disk in a temporary file. If configured, the NIC will remain on for WOL, or AoL. This level is also known as “Save to disk.”
S5 - Off
Everything is off. No files are saved. If configured, the NIC will maintain power to listen for WOL (Magic) packets. This is known as a shutdown.
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