Actual size of RAM is 4 GB, but it shows 2.96 GB why usable?

I installed Windows 7 Professional (32 bit OS) on my system and Pentium Dual Core processor.

And the actual size of the RAM is 4 GB but it is show 2.96 GB why usable?

In round numbers, XP, Vista and Windows 7 32-Bit Versions of the operating system can only address 4 GB. No matter how much you have installed 4 GB of memory is the maximum. The max your video card has xxx MB of ram on the card so that the limits of the operating system to 4 GB less cards xxx MO of memory.

In addition any other material also removes an additional quantity of memory (usually a small compared to the video card)
and the remaining memory (address space) is available for Windows XP, Vista or Windows 7 operating system and applications.

As well as 4 GB thru 16 GB of ram you have installed or will install goes unused on a 32 bit OS. No matter that reports BIOS or what the OS is showing as installed memory, it is still limited to 4 GB address this barrier.

A link to the white paper entitled "Gaming performance analysis" by Corsair
Memory Inc. provides a good clear explanation of how a video card effects
the amount of memory available on your PC.
See: http://www.corsair.com/_appnotes/AN804_Gaming_Performance_Analysis.pdf

Intel Chipset Support memory 4 GB system
http://www.dcomputer.com/ProInfo/support/support/mainboard/4GB_Rev1/4GB_Rev1.PDF

Users of Vista SP1 now report the amount of physical memory installed on your computer:
See: Windows Vista SP1 includes installed reports and system memory (RAM):
http://support.Microsoft.com/kb/946003

RAM, virtual memory, pagefile and all that:
Basic information about the implementation of virtual memory
in 32 bit versions of Windows 2000, XP, 2003 Server etc..
http://support.Microsoft.com/kb/555223

J W Stuart: http://www.pagestart.com

Tags: Windows

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