[Memory] New installed RAM recognized but not available

I have windows 7, i have 8gb of ram fitted and recognised but only 3.5gb usable why?
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More about memory installed recognized available
  1. Because you have 32-bit Win 7.
  2. This is the most asked question in the history of computer forums.

    You can't use more than 3.5gb ram with 32bit operating system.
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