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4gb Ram But Only 3gb Is Usable


I have installed windows 7 ultimate x64. In system properties, windows tells me i have 4gb ram but only 3gb is usable, displayed in the following format:

Installed memory (ram): 4. 00 gb (3. 00 gb usable)
But when i goto bios it shows: installed memory: 4096mb

My mainboard is of phoenix (quanta 30bc and my bios version is f. 2d released by hp) i have dedicated 128mb graphics card. On 64 bit version of windows i should be able to use my entire 4gb of ram why is it showing only 3gb as usable?


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