+1, its discouraging to have two graphics cards in a media server/gaming computer and the second card doesn't even turn on.
Did this 2 days ago, 6 1024*768 projectors covering 70% of a ballrooms walls for a corporate holiday party. Down and dirty, 6 slices, 4 masks for doors. Content was just a widescreen picture with snow and particle effect layers sitting on top. Ran across 2 machines, one i7-3930k with 2 7970 (only 1 working) running 4 screens+control, one i5-2500k with a single 660ti running 2 + control. I ended up doing a bunch of tweaking to the picture, and ultimately they both were running at about 40fps. Boss loved it, client loved it, got paid, awesome. Problem is they want it to be even cleaner and bigger, think 8 1080p projectors, and I don't think my current rig can render that, even when sharing the workload across 2 computers, unless I can use crossfire or effectively employ multiple gpus on a single machine. Suggestions or something I'm missing?