Extremely unstable gpu usage, stuttering in games.

[lattybtw]

Experiencing extremely unstable gameplay recently (in all games), its really stuttering. After looking at msi afterburner, the gpu usage drops when the stuttering occurs. The "power, %" is also unstable in a similar way (don't know if connencted). Any ways to fix this, any questions just ask. I have tried changing the psu, so that should not be the issue.
The specs are:
Gtx 1080
16gb ram 2667 MHz
17 8700k

 

[scout_03]

does it do the same in games lower settings .

 

[lattybtw]

Yes.

 

[scout_03]

test gpu in another system and if it does the same ask rma .