Rikishi basically hit the name on the head. If you want to do workstation work like Cad, Photoshops, Vegas, that kind of thing you can get by with a high-end gaming card, that will obviously work well for gaming as well.
If you NEED a workstation card for work, that demands a high end workstation card and I'm talking about those 2000+ dollar cards, you're better off just having another computer for gaming.
Although sure, a workstation card will play games.