Toshiba Portege M780 User Manual page 58

Memory
Module slot
Video RAM
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.
Legal Footnote (Memory (Main System))
For more information regarding Memory (Main System), please refer to the
Legal Footnotes section in Appendix H.
User's Manual
1GB, 2GB or 4GB memory modules can be
installed in the computer's two memory slots for a
maximum of 8GB system memory.
This computer can be equipped with memory
modules of a maximum size of 8GB. The actual
amount of useable system memory will be less
than the installed memory modules.
The memory in a computer's graphic adaptor,
used to store the image displayed on a bitmap
display.
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.
The amount of Total Available Graphics memory
will vary be between 1 and 2 MB depending upon
system configuration.
Hardware, Utilities and Options
3-2