ram being used alot but dont know what is using it

goga12

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Jun 27, 2014
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So i have 8 gig ram gskill 1600mhz and asus M5a97 le R2.0 mobo.Clean installed windows 64 Ultimate.I see on my computer properties it detecs 8 gig but 3.98 usable.I have tried maximum uncheck box a few times nothing,Dont know if its a bois setting mabey.Any help any bois settings would help,In hwinfo it picks up both 4 gigs ram and shows 8 gig.Have run windows ram dianostig tool did not show any errors.It is in correct slots on mob according to manaul.I am at a loss at how to fix it anything would help.My cpu is fx8320.