Higher number of cores.
C4D depends on what resolution and effects you have added to your project. For an example, it still takes me roughly 5-6 hours to render a 10 second clip. This is because I add Global Illumination, Ambient Occlusion, Depth of Field, and Motion Blur.
This clip right here took my 4.5ghz i7-2600K 30 minutes to render:http://www.youtube.com/watch?v=xJT1PeX0XYs