Interesting GPU/CPU Usage

[DrSanchez]

that's more than likely windows spreading the threads across all available cores. try it with a game you know is single threaded and you'll see spread 50/50 (if you're running a dual core) even though it spreads the threads it can never go above 100% total for a single thread.

plus as cod is multi threaded (I think) there could be situations where 1 thread is stalled waiting for another thread to release the data it want's to work on. this can stall the cpu also.