Toshiba SATELLITE U400 User Manual download pdf (Page 21)

User’s Manual 1-3

Introduction

Power

Main Memory

Disclaimer

Part of the main system memory may be used by

the graphics system for graphics performance

and therefore reduce the amount of main system

memory available for other computing activities.

The amount of main system memory allocated to

support graphics may vary depending on the

graphics system, applications utilized, system

memory size and other factors. For PC's

configured with 4 GB of system memory, the full

system memory space for computing activities will

be considerably less and will vary by model and

system configuration.

If your computer is configured with two 2 GB memory modules, the

memory might be displayed as approximately 3 GB only (depending on the

computer's hardware specifications).

This is correct because the operating system usually displays the available

memory instead of the physical memory (RAM) built into the computer.

Various system components (like the video adapter's GPU and PCI

devices like Wireless LAN, etc.) require their own memory space. Since a

32-bit operating system cannot address more than 4 GB of memory these

system resources overlap the physical memory. It is a technical limitation

that the overlapped memory is not available to the operating system.

Even though some tools might display the actual physical memory built

into your computer, the memory available to the operating system will still

be approximately 3 GB only.

Video RAM Depending on the model you purchased:

Mobile Intel

GM965 Express Chipset/Mobile

Intel

GL960 Express Chipset model: Video RAM

capacity shares with main memory, and the

proportion depends on Dynamic Video Memory

Technology.

Battery Pack Your computer is powered by a rechargeable

lithium-ion battery pack.

RTC Battery The internal RTC battery backs up the Real Time

Clock and calendar.

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Toshiba SATELLITE U400 User Manual Page 21