Check out the A new Brigade 2 Engine Tech Demo Video. This demo is the Game Release Party version of the student game "It's About Time" and is playable on NVidia hardware only. This tech demo is said to use all your GPUs if you have more than one installed, meaning that it does support SLI. The game uses the Brigade path tracer for rendering. Path tracing is a process that constructs a large number of paths between the camera and light sources (typically via scene surfaces) to estimate the color of each pixel. Video and screenshots after the break.
This is a stochastic process, which causes the noise in the images. Although more samples would reduce the noise, path tracing is rather compute-intensive. Brigade runs on one or more GPUs to provide sufficient processing power.
The scenes in the game show some typical characteristics of path traced rendering. Obviously there is the noise, but this is more severe in poorly lit rooms, and rooms with complex glass materials.