S!
I left CCC open and alt/tab to check clocks during game. They did not go higher than 500MHz. I overclocked the card but still the same?!
Also these black cursors people talk about are gone for me. I closed all the info windows, could that do it? Also overriding AF in CCC helped with graphical artifacts.
I tested Very High settings and got 11-38FPS over sea/land. Lowering to High helped a bit, but there is a lot of pauses and stutter. When these issues are solved the game will look simply gorgeous