the whole thing is that I tried enabling crossfire then dissabling it.
The hardware is combined out of 2 5970s
Trying phoenix and poclbm miners bot hgive the same result.
Regardless which device I start the mhash /s will not exceed 300 if I start 2 that will device 300 in two if three the 300/3 if four then the system hangs.
I tried rebuilding the whole machine from the scratch same issue.
I tried different drivers 2.1 then 2.3 no luck either.
I double checked every possibility to see why this setup behaves like it had crossfire enabled but could not find any reasonable solution.
I am suspecting the mother board now it is ASUS_M4A77TD_PRO (http://www.asus.com/Motherboards/AMD_AM3/M4A77TD_PRO/
It has something called ATI CrossFireX™ Technology Support i tried to find that option in BIOS in order to disable it but to no avail.
Any ideas? Anybody else had an issue with this motherboard?
Thanks for your replies lads.