Question 16 gb ram fps dropin stuttering

Apr 21, 2020
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I have got 2x8gb ram but my games are only using 8gb ram or 7.5gb not more than that. I used to have 300 fps in csgo now i am only having 100 fps they are also droping to 80 sometime. My gpu is rx580.
Motherboard h81
Psu 600w seasonic
Core i5 4440.