System Information
linux 64, nVidia GTS 250
Blender Version
2.69.1
Short description of error
Artifacts are become for lowpoly models.
Video: http://www.youtube.com/watch?v=_pvcLyHokbY&feature=youtu.be
File: https://dl.dropboxusercontent.com/u/26887202/blender/ren_2_69.blend
Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps