Evga 1080ti sc wont overclock

[T3King]

I'm running a stress test on my evag 1080tisc that I got someday ago. I'm using msi kombustor to stress test gpu. I'm getting small stutters every so often very small tho. The picture I posted is the image on the stress test it goes up and down side to side and it stutter very little. Why is this??? Also another question. Why cant i overclock my GPU when I do it crashes right away is it that my power supplie is to low I'm over clocking the core clock 40 at a time but crashed right away then I overclock the memory clock by 100 and crashes right away  How long should I run the test for???? Specs  Mobo z370 f  Cpu i7 8700k Gpu evga 1080ti sc Ram 16gb 3200 cl 14 Power sup evga 650 gq       

[Mick Naughty]

For one it’s a 1080ti, so that’s life. Also have you tried benchmarks, like actual ones. 

 

Maxing power, voltage and fans while doing so?