could you guys try to see if you can put the crossfire working properly because in crossfire the ati cards tend to loose very mutch performance
We cannot, and you can see the same degradation in any mining and even in some games that support multiple cards natively. To get best performance from 2 cards, you have to disable crossfire and run them separately.
win miner is new version?
download, update and I have increased rig productivity by 5% )
It is version 1.3 from Jan 12, I am not sure how much new it is
Its difference from 1.2 is reduced stale shares submitted.
Next version will have stratum support to (almost) eliminate stales.