Sony VGN-TZ340NCP - Manual (Page 148)

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Customizing Your VAIO Computer
Changing the Performance Setting
You can change the memory configuration that affects power consumption while your computer is in Normal mode.
To change the performance setting
1 Click Start, All Programs, and VAIO Control Center.
2 Double-click Power Management and 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.