Intel SpeedStep is disabled, why is my CPU going stupidly slow?
i5 2500k 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
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What temps? Sounds like overheating.
Reset bios settings and test or enable speedstep again and test