Bulletstorm is one of the best in the current crop of games. Although only in DirectX 9 mode, the rendering is pretty nice, based on version 3.5 of Unreal Engine.
All the graphics options were pushed to a max (high) and we measured performance with fraps.
The Radeons do very well in this game and the Radeon HD 6990 has a significant lead over the GeForce GTX 590.
Although the GeForces do pretty well in surround gaming, they are more impacted by activation of antialiasing.
The GeForce GTX 590 is on a par with the GeForce GTX 570s in SLI once 3D Vision is activated. These systems are a long way ahead of the GeForce GTX 580 when antialiasing is activated.