Sony VGN-TX850P - Manual (Page 127)

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Customizing Your VAIO Computer
Changing the Performance Setting
You can change the memory configuration that affects power consumption during Normal mode.
To change the performance setting
1 Click Start, point to All Programs, and click VAIO Central.
The VAIO Central window appears.
2 Double-click Power Management on the System Information tab and then Performance.
3 Select Memory bus: 400 MHz Priority is given to saving power.
By default, Memory bus: 400 MHz Priority is given to saving power is selected.
4 Click OK.
5 At the confirmation prompt, click Yes.
!
To activate the change, you must restart your computer.