wikipedia hovori:
For example, systems may be put into extremely low consumption states, i.e. in which only memory, or not even memory is powered, but from which "general-purpose events" (GPEs, similar to interrupts, which can be sent by devices such as the real-time clock, keyboard, modem, etc.) can quickly wake the system.
Hibernate is a feature seen in many operating systems where the contents of RAM is written to non-volatile storage, such as the hard disk (as either a file or on a separate partition) before powering off the system. Later the system can be restored to the state it was in when hibernation was invoked, so that programs can continue executing as if nothing happened.
If you really want to be green with your PC, when you're done using it turn it off
Scott Richards, power supply manufacturer
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