HP Evo Notebook n620c Software Guide: Compaq Evo Notebook N620c Series - Page 31

Processor Performance Controls (Select Models Only), Windows XP Processor Controls

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Power Processor Performance Controls (Select Models Only) Windows 2000 Professional and Windows XP provide different software that allows the user to control processor performance. The CPU (central processing unit) speed can be set for optimal performance or for optimal power conservation. For example, the software can be set to trigger an automatic change in processor speed when the power source changes between AC power and battery power, or when notebook use changes between active and idle. Processor performance controls vary depending on the operating system. Windows XP Processor Controls In Windows XP, processor performance controls are included with the operating system and managed in the Power Options window. Accessing XP Processor Controls To access Windows XP processor performance controls, select Start > Control Panel > Performance and Maintenance > Power Options > Power Schemes tab. The user sets the desired Power Scheme and that, in turn, sets the processor controls. Each Power Scheme for AC power or battery power equates to one of the following processor levels: ■ Constant: Always runs at the lowest performance state. ■ Adaptive: Performance state is selected based on CPU demand. ■ Degrade: Starts at lowest performance state, then uses linear performance reduction (stop clock throttling) as the battery discharges. ■ None: Always runs at the highest performance state. 2-20 Software Guide

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Software Guide
Power
Processor Performance Controls
(Select Models Only)
Windows 2000 Professional and Windows XP provide different
software that allows the user to control processor performance.
The CPU (central processing unit) speed can be set for optimal
performance or for optimal power conservation.
For example, the software can be set to trigger an automatic
change in processor speed when the power source changes
between AC power and battery power, or when notebook use
changes between active and idle.
Processor performance controls vary depending on the operating
system.
Windows XP Processor Controls
In Windows XP, processor performance controls are included
with the operating system and managed in the Power Options
window.
Accessing XP Processor Controls
To access Windows XP processor performance controls, select
Start > Control Panel > Performance and Maintenance > Power
Options > Power Schemes tab.
The user sets the desired Power Scheme and that, in turn, sets the
processor controls. Each Power Scheme for AC power or battery
power equates to one of the following processor levels:
■
Constant: Always runs at the lowest performance state.
■
Adaptive: Performance state is selected based on CPU
demand.
■
Degrade: Starts at lowest performance state, then uses linear
performance reduction (stop clock throttling) as the battery
discharges.
■
None: Always runs at the highest performance state.