I have a quad monitor setup with an HD5570 workstation graphics card.
I am wondering before the fact if it is possible to use two high-performance cards such as an R9 or GTX 9X0 series in CrossFire or SLI mode to drive all four monitors.
There is an older question that answers this, but it is from 2012, and I'd like to get an updated answer if it has changed and what the ramifications are with ATI's Eyefinity project.