For me everything works at the moment since I have switched cards and changed the direction of the cables as described in my thread.
Harbi, this problem is known, one of my friends has the same problem on Win 8.1 and since crossfire is working for me as well, with the latest drivers I get the same results on the ASUS GPU tweak tool. GPU usage like 99% at all the time. However I don't really worry about that since I think it is just a bug in the tool and not really the card that has a load if 99%.
I have had a ***** mining virus a while ago and THEN the 99% in idle where true and you could hear that as well since the themps and the fans got up as well which isn't the case now.