My CPU was fine for a very long time and all of a sudden (after installing a new CPU fan recently) I have been having bad FPS and slow processor speeds. So I decided to do a 'quick' intel burn test. Here is what happened
During: http://puu.sh/6IqTQ.png  (processor only going ~800MHz, should be going 3.3GHz)
Post: http://puu.sh/6Ir0t.jpg  (224 seconds for 2 tests, it should be about 25 seconds)
Notes; Intel SpeedStep is disabled.
My CPU is going 1.6Ghz as I type this.
I have a GTX 780 and I was getting bad FPS during CoD4 because of my processor going ~800Mhz