Have a pretty decent pc but getting huge fps drops

Apr 11, 2018
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Hello, I would like to know if anyone has a solution to my problem.
PC specs:
i5-7600k @ stock
GTX 1080 @ stock
8GB 2400mhz ram (single slot)
120gb ssd
1tb hdd
750w power supply

So, i get like really huge fps drops. For example, while i play cs:go or fortnite. My fps drops down to 50fps quite often. Drivers are up to date. Temperatures seem normal. Would be really thankful if someone could help me identify the problem