I'm trying to use multiple AMD Radeon R9 380 Series cards to support a 2 x 4 multiple monitor configuration. The first cards seems to work perfectly. The second card doesn't do anything. All the monitors are the same hardware. I use 2 DVI ports, 1 HDMI port, and 1 Display port. I want to so the same on the second card as well. Suggestions on how to proceed are appreciated.