HP Workstation x4000, Technical Reference Manual

Page: 89 / 238

Power Specifications
Power Saving and Ergonometry
Chapter 6 89
Power Saving and Ergonometry
Depending on the operating system, the following power management
modes are available:
• Full on (S0)
• Standby (S1)
• Hibernate (S4)
• Full off (S5)
NOTE Windows NT 4.0 does not support S1 or S4.
Using Power Management
Power management lets you reduce the Workstation’s overall power
consumption by slowing down the Workstation’s activity when it is idle.
Operating systems differ in their power management capabilities. In
Windows 2000, you can select from two power management modes:
• Stand By (S1) is a low power state where the processor is shut off, but
memory remains powered. Waking up the Workstation from Stand By
mode is faster than from Hibernate mode because the RAM contents
do not need to be restored. However, when the Workstation is in
Stand By mode, it consumes more power than Hibernate mode
because the memory remains powered.
• Hibernate (S4) makes the machine look and behave like it is off
except that it remembers the state it was in before hibernation and
can be awakened without a full operating system boot. This is
because the operating system copies the RAM contents out to a
special location on the hard disk before entering hibernation.
You must enable Hibernate mode through Power Options in the
Control Panel before it can be a shut down option.
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