a

[PunchMyNuts]

a

[Zorlofe]

Do you have the two molex connectors and the one SATA power connector on the MB hooked up? Also, make sure that you are splitting the power equally with your power supplies. Having poor power from a crappy power supply can cause stability issues. I had some problems with mine until I had two good PSU's that provided stable power.

[PunchMyNuts]

I have the 2 Molexes connect and I use x2 evga supernova 1600 psu

[patofet]

If you have windows you need to update first, they solved several bugs when try to add more than 8 GPU in one windows

[Zorlofe]

I have the 2 Molexes connect and I use x2 evga supernova 1600 psu

There is a third SATA power connector by the molex connector near the bottom of the board that should be connected too.