User's Manual

5.1.4 SpeedStep
Your notebook is equipped SpeedStep technology to better
manage power consumption. It changes the processor speed to
find the best balance between your computing performance and
power consumption needs. Higher speeds enjoy better
performance, while slower speeds conserve more power.
In Windows XP, the processor's performance level depends on
the Power Scheme you select (see Power Options Properties).
You do not need to make any further adjustments to set the
performance level. Each preset power scheme has different
time-out settings for entering standby mode, hibernate mode,
turning off the display, and turning off the hard drive.
For example, the Portable/Laptop mode automatically changes
SpeedStep modes depending on if you are running the computer
on AC power or batteries in order to prolong battery usage while
still providing optimal performance.