I highly doubt that my GTX970 is unable to handle this game...
As mentioned in other previous posts, HT on or off doesn't make a difference, HD Audio enabled or disabled doesn't make a difference, and changing down from ULTRA settings also doesn't make a difference.
Going to try the window mode, but considering I'm only running 1920 x 1080, it isn't exactly stressing out the system.
Hell, the fan on my GTX970 barely even has to power on!
And I also play WoT, at maximum setting for everything, running a steady 80 - 110 fps. Since you play WoT also, you know what sort of power this rig has to be able to do that.
Now don't get me wrong, it may be that nVidia cards are the common factor, but it certainly isn't due to lack of power, it is some other issue, that in this case may well be either a programming issue, or a Unity issue.