Question about GPU and CPU utilization while playing games

Okay, I quite recently became interested in computer hardware, and I have learned a lot over the past few days, however there is one thing about my system that i don't understand.

When i play starcraft 2 on low graphics i get around 150 fps, however when i load up windows task manager and MSI Afterburner the graphs seems a little odd to me. While playing the CPU is utilizing about 30-40% while the GPU is using around 30%.

My question is, why isn't my CPU\GPU using 100% (or at least one of them) in order to give me as much FPS as possible?
Is there any way i can force them to give me as much FPS as possible?

My specs are:

CPU: AMD Phenom II X4 970 Black Edition @3,5ghz, overclocked to 4.0 ghz

Motherboard: Gigabyte GA-880GM-UD2H, Socket-AM3

PSU: Chieftec Nitro Series BPS-750C 750W PSU

Monitor: BenQ 21,5" LED G2222HDL

GPU: BenQ 21,5" LED G2222HDL

Ram: Crucial DDR3 1333MHz 8GB KIT, CL9

Please help me understand.
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  1. Best answer
    the game only uses 2 threads and the main thread is clearly maxing the core it is running on. Combined with the other thread it results in a 30-40% cpu usage on a quad core cpu. So you are indeed cpu bottlenecked at your current settings. This also means that you could increase the eyecandy on the game without suffering a fps hit since the gpu isnt really working that hard at all yet.

    SC2 cpu and multicore scaling:
  2. That was a very understandable answer, thanks!
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