Yes, incorrect syntax on -di parmeter: no commas between the numbers i.e: -di 012
-di 012 -cclock 1150,1150,1150 -mclock 1980,1980,1980 -cvddc 950,950,950 -mvddc 950,950,950
Still didn't work.
The commas also work, as it only selects those cards when I use those, EG; -di1,0,2 (3,4,5,6,7 - do not start)
Using AMD GPUs? If so, then check and make sure that Crossfire mode is off, that usually creates a similar issue to what you are describing.