okay , well a friend got the same hardware (actually he got a i5 6600) and his games run perfectly fine !
i reinstalled the drives and updated windows.
and i will upgrade my ram but i´ve never heard that ram got impacts of the fps ...
maybe you have other suggestions, cuz im almost crying sitting here infront of my GPU
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1080p 144hz (no hate, makes sense if u want to use the full refresh rate )