HA !
It finally works !!
Someone already mentioned the 4g option to me before, but i was not able to find it in bios... coz i did not have it updated... now i feel really stupid... half an hour action and i spent 2 days on it

So now just tweaking issues ahead of me it gives me 70-ish Mh/s and im hoping for 80-90 after some overclocking...

Bad thing is, if i use MSI afterburner to move my memory clock, it adjusts just one of the cards and the rest falls down to 300Mhz instantly.
 on different drivers i was not able to OC with some software at all...
I guess that leaves me with bios flashing, which i never done before. Im sure i will google some guide, but if you have some general tips, or something i should be careful about, i will happily take your advice