Low FPS on 3.3.5a with a R9 290

I have low FPS with the 3.3.5a client on a R9 290, for example in Dalaran (slightly crowded) with max settings but low shadows I have around 40 fps.

I thought it was good but it turns out similar cards achieve 200+ there, so I was wondering what could be wrong.

No, computer is not throttling due to overheat. CPU is i7 4790k.

Any help appreciated.