Following your post, I’ve disabled the Crossfire function. Guess that the AMD work in OpenCl mode without setting specific parameters (that I did not find anywere).
The result is the same: some nomadic call to the card (duration few seconds).
Anyway, I understand from your notes that SONY is late, or – worse – not interested in updating its software in order to take advantage of the new video cards. Frustrating.
Sergio