980ti bottleneck?

[Tove]

Hey, I recently bought a EVGA 980ti superclocked. (Note: The one with the reference cooler.). When I benchmark in unigine heaven I get a score of around 2270. Which according to other 980ti scores I found on the internet is okay. But when I benchmark in unigine valley I only get a score of about 3800. Which compared to other 980ti scores is a bit low. In GTAV I get a avg 60fps. Which occasionally drops to about 30fps in blane county. Am I expecting to much or is the card bottlenecking? 

 

Temperatures under full load don't exceed 80C and usualy sit around ~75. ~30C on idle.

 

Pc specs:

Mobo: ASRock Z87 Extreme 4 

RAM: Corsair vegeance 16Gb

PSU: EVGA supernova 850 G2 80 plus gold

CPU: I7 4790K 4Ghz

GPU; EVGA GTX 980Ti Superclocked

 

Hope you guys can help me out. 

 

P.s. I'm not a native english speaker. So please forgive me for any grammar mistakes.

[ZetZet]

there is no bottlenecking in that system. check drivers or something.

[Tove]

I've got the latest Nvidia driver for the 980ti. But is it actually not performing like it should? And what could it be if it's not the drivers.

 

Below my Unigine valley benchmark.