Mafia II is an open world "crime" title from 2K Games. It is the second game in the Mafia series. The demo comes with a built-in benchmark tool that offers both indoor and outdoor environments, various lighting effects and fire.
A single card won't quite hit 30fps in Eyefinity, but a CFX setup will in 3x1-L and just barely miss it at 5x1600x900. Mafia II proves to be quite a demanding benchmark for Eyefinity.