Toshiba P300 User Manual page 27

Memory
Slots
Main Memory
Disclaimer
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.
User's Manual
PC2-5300 (PM965/GM965/RS690M)/PC2-4200
(GL960) 512 MB, 1024 MB or 2048 MB. Up to
2 GB memory module can be installed in the
memory slot for a maximum of 4 GB
(PM965/GM965/M690G), 2 GB (GL960) system
memory total, depending on the model you
purchased.
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.
Introduction
1-3