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i5-2500k @ 4.5GHz keeps underclocking to 1.6GHz

My i5-2500k keeps underclocking under the slightest load (usually when transferring files) to 1.6GHz. It's not thermal throttling at all, it underclocks when it is still under 40C.

I took some screens of the current situation. On top is the regular clock and temps, and below is where it's underclocking. I should state that when I originally did the overclock, it passed a 4 hour prime95 test without any issues.

I did already do some research and never found anything helpful. The cpu is on a GIGABYTE GA-P67A-UD4-B3 motherboard, and cooled with a Hyper 212 with properly applied thermal paste.

Any information is appreciated.
4 answers Last reply Best Answer
More about 2500k 5ghz underclocking 6ghz
  1. 1.6GHz is the standard clock when CPU is on idle.
    Just make your CPU do something and it'll be back to higher speed.
  2. Best answer
    If you didn't disable Speedstep, it is just doing what it is supposed to do when not heavily taxed... slow down to conserve wattage and reduce heat. I left Speedstep enabled for my mild O/C on mine because I don't need more speed during 90% of my use. When I game, it goes back to full speed.
  3. Oh well now I feel dumb. Makes sense though. I just did a brief prime 95 and it didn't underclock. Thanks guys.
  4. Don't feel dumb. We all learn the same way ;-)
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