System will not use all the memory available on a 64 bit system

I recently bought a laptop DV7. It contains Windows 7 Professional 64-bit and 8gbs of Ram. The system uses only 4gbs of Ram. Why is this? Is there something that can be done, so windows uses the full 8gbs?

Thank you

Here is the article will tell you how the OS & hardware reserves physical memory... http://blogs.technet.com/b/markrussinovich/archive/2008/07/21/3092070.aspx

I noticed some discrete graphics cards are reserving large quantity of memory... but having said that, I did not affect the performance of the system...

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