I feel embarrassed asking this, I thought all 5000s supported it. Not to mention, it doesn't say anything about Crossfire. I figured it was just the naming convention, so I went to their website to see if all their cards were listed like that, but they had other cards that specifically mentioned crossfire and eyefinity in the specification listing, but their 5830 didn't. Am I reading too much in to it?
Yes, it supports eyefinity. There is a display port at the top of the bracket. Basically, all the 5000 series cards are capable of supporting eyefinity, even a lowly 5450, so long as they have a displayport connector.