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Thread Starter 
Hi Everyone!

At first, here is my rig:
Gigabyte Z97 D3H
i5 4670K @ 4.3 GHz
16 GB DDR3
MSI GTX 970 Gaming 4G - only a few months old
EVGA NEX-750B PSU (750W, 80+ bronze) - only a few months old

My problem is with limitating circumstances.

As I see GPU-Z sensors, I have PerfCap (VREL) limit constantly while GPU load. I don't see any effect on clocks, doesn't make crash or anything, but this VREL "limit" appears constantly while load. By the way clocks are stable if I don't have any other limits.

The bigger problem is that sometimes I have power limit, even if I don't increase clocks or anything. It appears for example in Furmark, but only when extreme burning mode AND PostFX are enabled too. It appears too in some extra GPU demanding games, like Witcher 3. And when I reach the power limit, GPU is throttling a little bit of course.
If I set power limit to 110%, the card can reach this 110% too, and then throttling a little bit. Even if I don't overclock, the card can reach 110% power limit when Furmark is running with extreme burning mode and PostFX enabled, or when any extra GPU demanding game is running.
Voltage increasing doesn't solve the problem.

What can be the problem?

Thank you for your help!