Hi Fakhry Shousha,

This is expected behavior on computers. The reduction in available system memory depends on the configuration of the following:

• The devices that are installed in the computer and the memory that is reserved by those devices
• The ability of the motherboard to handle memory
• The System BIOS version and settings
• Other system settings

For example, if you have a video card that has 256 MB of on-board memory, that memory must be mapped within the first 4 GB of address space. If 4 GB of system memory is already installed, part of that address space must be reserved by the graphics memory mapping. Graphics memory mapping overwrites a part of the system memory. These conditions reduce the total amount of system memory that is available to the operating system.

There are several additional situations that could cause the usable RAM to be less than expected. These issues and possible solutions are listed here:

Check the system configuration settings

This problem may occur because the Maximum memory option is selected incorrectly. To fix this, follow these steps:

• Click Start, type msconfig in the Search programs and files box, and then click msconfig in the Programs list.
• In the System Configuration window, click Advanced options on the Boot tab.
• Click to clear the Maximum memory check box, and then click OK.
• Restart the computer.

Also, check the memory in BIOS.

• • Restart / Power on your computer
  • At the first text on the screen or when the Dell™ logo appears, tap until the message Entering Setup appears.
  • Memory will be listed as Extended Memory in the Main tab

Awaiting your response!