Normal.

The reason it goes so high is because gpu boost 3.0 is dynamically controlling the clocks.

the speced clocks like from here are the guaranteed min  you can expect  if your card does better then great   its nothing but a plus  
 
ftw  gaming

• 1607MHz Base Clock
• 1797MHz Boost Clock 

    =  the min evga guarantees this card will do   anything you get stock out of the box over that  is nothing but gravy  [best I understand that ]
 
enjoy 

If you don't want a dynamically clocking card then I suggest going out and purchasing an AMD card or a GTX 400 series card.
 
Or you can always return the FTW and get a base model (non-factory overclocked card), which you can then select Debug mode from the nvidia control panel which will keep the card from boosting the GPU clock past "stock" speeds. I don't think that factory overclocked cards have that option, as it is grayed out.
 
But why would you do that? There is no point as GPU boost (automatic dynamic overclocking) has been a thing with nvidia cards for a long time now.
 
It does not reduce GPU lifespan, and you went with EVGA (I assume) to get the best warranty and customer service possible from a GPU vendor in case there are any issues.

Ok, the auto-overclock is not that bad, the thing is that the overclock push the card over the limit of 1797, even 2012MHz and also the voltage goes up.
I like the boost3.0 that gives the best clock possible, but it shouldn't go over my boost clock.
Why I can't control the overclock?
Is just my card?

Anyway thanks for help :) now I'm quite more relaxed :P

dude , its fine    luck of the draw was on your side    just think how many guys got that same card and don't even get close to what yours can do stock out of the box   ..   like said you well above the min spec of that line of card  that's nothing but a plus   and what we hope for in any card we buy .  not the lowest of the bunch   you did well on a card  it works as it should normal  [well better] ,
 
you sure don't look to get a ftw and only at best get that min   or it runs only at say a lesser models specs like a plain jane 1070 gaming  ???
 
your cards fine you got better then average  or at least better then spec.    that's what we want and hope for   in any card
 
''the thing is that the overclock push the card over the limit of 1797, even 2012MHz and also the voltage goes up''    who don't want that ???   and then it takes power to make power   that's physics and life   with any card   ypu got to have the voltage to maintain the clocks stable as possible.   all card have a thermal and power/voltage limit   then throttling sets in 
 
''   Since the introduction of Kepler, NVIDIA has introduced fine-grained voltage points, which defines a series of GPU voltages and their respective clockspeeds. The GPU in turn operates at points along the resulting curve, shifting clockspeeds based on which voltage it’s at and what the environmental conditions are.''
 
http://www.anandtech.com/show/10325/the-nvidia-geforce-gtx-1080-and-1070-founders-edition-review/15
 

ya, that may give him what he wants ?
 
http://www.evga.com/support/faq/afmviewfaq.aspx?faqid=59594
 
good luck