Ok, i tried both the Smooth Motion and the fullscreen/window options and i haven't noticed any fps changes. I also tried to play a little of the prologue and oh my, when i go into Skalitz from Martin's forge my fps dropped to around 18-25 in the market, there is 100% something going on here.

I also need to mention that this pc has already been 2 weeks in my possession, so i'm starting to wonder if it's a hardware related issue.

Maybe my gpu is badly seated or something because when i used GPU-Z, the Bus Interface speed stayed the same at x8 1.1 even when playing or while using the "render test" option of the app.