secondly (pausely) stuttering in games

Oct 28, 2018
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hello here is my rig
6700k
16 gb ram
msi gtx 1080 gaming x
asus z170 pro gaming

at first sorry for my bad english because im not native speaker of en

after upgrading from gtx 970 to 1080 ( i play at 1080p). i noticed that in some areas of the game i tested ( ac origins ) and aslo in benchmark mode i have some pause like stuttering and fps drop from 90-85 under 55-60 for 2 or 3 second. regarding that my rig is too high for 1080p at it should run all games smoothly more high than 60 fps. so whats the reason for this problem? it this software related or my harware (cpu or gpu) casued the problem?