Cinema 4D rendering
Cinema 4D's rendering engine does a very nice job of distributing the load across multiple processors, as the Task Manager graph shows.

The P4 670 looks relatively stronger in Cinebench, but the Pentium D 820 still leads it.

Cinebench's shading tests are single-threaded, and it shows. The Pentium 4 670 handles these tests well enough, but the Pentium D 820 is practically outclassed by the rest of the field, including the Athlon 64 3500+.