Toshiba Satellite C640 - Manual (Page 46)

User’s Manual 3-2
Satellite C600/C640/C645/C600D/C640D/C645D, Satellite Pro C600/C640/C600D/C640D
Memory
Power
Memory slots 1 GB, 2 GB or 4 GB memory modules can be
installed in the computer’s two memory slots for a
maximum of 8 GB system memory.
This computer can be equipped with memory
modules of a maximum size of 8 GB. The actual
amount of useable system memory will be less
than the installed memory modules.
Video RAM The memory in a computer’s graphics adaptor,
used to store the image displayed on a bitmap
display.
The amount of Video RAM available is
dependent on the computer’s system memory.
Start -> Control Panel -> Appearance and
Personalization -> Display -> Adjust
resolution.
The amount of Video RAM can be verified by
clicking the Advanced Settings button in the
Screen Resolution window.
If your computer is configured with more than 3 GB memory, 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.
Computers configured with a 64-bit operating system can address 4GB or
more of system memory.
Legal Footnote (Memory (Main System))
For more information regarding Memory (Main System), please refer to the
Legal Footnotes section in Appendix E.
Battery pack The computer is powered by one rechargeable
lithium-ion battery pack.