I have 5 cards on my system.  R9 270, rx 570, (2) rx 470, rx 480.  No matter what I do, one card will always fail except the r9 270.  It starts every single time.  I get Gpu X failed, disabled.  Any tips?  The only time I don't get a failure is if I have just the r9 270 and one other card connected.  I'm running windows 10.  I have used drivers 16.9.2, the block chain drivers, and the latest amd drivers.

Thanks,