Well I don't know what happen, but now I can't reach same RAM usage after restarting computer and got new updates for windows 10. I think it's fixed. However I'll inform if something strange will appear again. I tried push limit with 2 games, and it don't reach same amount of ram usage. From now I'll keep watching my task manager if any huge ram usage would appear.

Thank you guys for help.
I'll Mark this as Solved.