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There are 6 different modes. S0 S1 S2 S3 S4 S5 S0- Working S1-: All processor caches are flushed, and the CPU(s) stop executing instructions. Power to the CPU(s) and RAM is maintained; devices that do not indicate they must remain on may be powered down. S2- The CPU is powered off. S3- Commonly referred to Standy By or Sleep. The RAM is still powered. S4- Hibernation. All content of main memory is saved to non-volatile memory such as hard drive, and is powered on. S5- Soft Off-- G2, S5, and Soft Off are synonyms. G2 is almost the same as G3 Mechanical Off, but some components remain powered so the computer can "wake" from input from the keyboard, clock, modem, LAN, or USB device.

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