[Eganmedia]

I have a newer (mid 2012) Mac Pro 5,1 with an upgraded processor as well. After searching around I jerry-rigged a very stable system with a used AMD Radeon HD7950. It allows me to have 4 monitors- 2 X 1920 x 1080 for mix/ edit, 1 x 4K for a video projector for picture and 1 1920x1080 for ADR/ studio.

The HD7950 requires two power connections and I only had one available on the motherboard. I found a thread somewhere that suggested there was sufficient power available from the second DVD bay. It took some finagling to get the cable run up to the optical bay, but it works perfectly.