ram not being used fully

goga12

Distinguished
Jun 27, 2014
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I have g skill 2x4gb ram and mobo asus m3a97 le R2.0

It shows 8 gig ram used but 3.98gig usable.Iam running windows 7 ulitmate x64bit.I have tried the maxium ucheck box but nothing.Something odd i saw is when pc starts up it uses 47 percent ram usage so something must be using all my ram but what?i see in hwinfo that it picks up 8 gig ram.so any ideas whats going on.I recentlly installed new windows.