Hello Bitcoin Forum!

i got issues with my mining rig.

my system:

ASROCK FM2A78M PRO3+
AMD A6 6400K Dual-Core Processor
Platimax 80PLUS 1350
8GB DDR3

so i got 3 GPU´s

first one is a R9380 STRIX . works all fine on solo mining
the another 2 are R9390 WINDFORCE if i try to solo mine with them they work for 5-15 min after them i got a blackscreen and can only restart the system...

if i dual mine its the same issue with the blackscreen

what i try to fix the problem.

15.12 driver - failed
newest driver failed
riser changed - failed
another psu - failed
more virtuall RAM - failed

if i underclock the r9390 windforce and set the setting from the miner after 100 to 80% it works longer but again with blackscreen...

what i can do..
i set already the underclock on Mem clock 950 and gpu clock to 700 and again the issue..
i changed the power limit from the power limit (%) to +50 .. again blackscreen its wayne if i give him -50 +50 or 0 ...

i dont know what to do guys please support me ... i only want that this thing work.. i dont want the 390 sols if i can only 200 is enoguh.. only should to work one day without blackscreen...

another info.
but if i try on a another PC to play games with the r9390 windforce it works fine..
i played 5 games overwatch and no lag no blackscreen..


sorry for my bad english !

and all things in your mind are here welcome