Question GPU usage and FPS fluctuating

[despawn]

Hello guys, when I play pubg or divinity 2 original sin my gpu usage and fps fluctuating very much. You can see msi afterburner monitor below. When I use benchmark it uses 100%. I already tried to use DDU and reinstalling drivers but not solved my problem . Could you help me ?

I've a Asus 1070 Ti, i5 8400 and 16 gb ram.

PUBG , Divinity2 , World of Warcraft

 

[rgd1101]

what the cpu usage?
ram usage?
brand and model of the psu?
hdd or ssd?

 

[despawn]

1,2,3,4 please check these pictures as well.

High Power 750W 80+ Bronze 56A@12V

GIGABYTE 480GB SATA 3.0 2.5" SSD