Having problems with your Toshiba Satellite A75-S226 Notebook ?

A75 not recognizing all of the memory - Toshiba Satellite A75-S226 Notebook

Answers :

How much of the memory is not being recognized out of the total RAM?
\015\012Most laptop video cards do not have built-in RAM and part of the main memory is used for video RAM. Depending upon the video chip, it could grab 256Mb or more RAM for video.
\015\012If the RAM is equal to the extra RAM module being installed, then the problem could be incompatible RAM module or a faulty memory expansion slot.
\015\012Try and use RAM with the same speed and from the same manufacturer.
A 32-bit operating system, such as the Windows Vista or the Windows XP operating system, can only generate 4GB of memory addresses. Since some of these memory addresses are used by certain hardware components, there are not enough memory addresses left to map 4GB of Random Access Memory (RAM). This issue can cause the operating system to report the amount of RAM as approximately 3GB.

Some examples of hardware components that use memory addresses are:

* Graphics adapter
* PCI bus
* PCI Express support which may require up to 758MB
* BIOS, ACPI and legacy video support

Windows Vista Service Pack 1 reports the amount of system memory correctly.
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