PCM05 will only utilize 4 cores / threads.
It's not much of a load for your 6 Cores / 12 threaded 3930K.
Try setting your power profile to "high performance" though... Just to make sure you're getting maximum clocks all the time, and that SpeedStep isn't downclocking you to idle.
Just the first couple things that came to my mind.... I'm sure others will have some better ideas.