CPU underclocking under load

So here's the story, I've overclocked my 880K to 4.3 Ghz, but I've also noticed that the CPU underclocks itself from 4.3 to 3.7 Ghz when under load. I'm thinking it's my PSU because...it's cheap and it's not rated. I've also set the power option to "Prefer Maximum Performance". Also Windows always crash under load when I set the CPU Load Line Calibration to ±20% or up. Temps are also fine.

My PC Specs :
AMD Athlon X4 880K @4.3 Ghz 1.38 V (stock cooler)
Biostar A88MQ
Dtech PW006 450W
Reply to jrglol
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More about cpu underclocking load
  1. 1| The source of your issues can be a number of things. One such factor is the lack of proper airflow.
    2| The board you're working with isn't exactly geared towards overclocking since it lacks the proper heatsinks to dissipate the heat from the VRM area.
    3| The PSU is also shady and is the culprit if your system decides to croak.
    4| You shouldn't be on the stock cooler with that kind of an overclock. In fact your voltages look high. It should be around 1.25v, max at 1.28v.
    Reply to Lutfij
  2. Lutfij said:
    1| The source of your issues can be a number of things. One such factor is the lack of proper airflow.
    2| The board you're working with isn't exactly geared towards overclocking since it lacks the proper heatsinks to dissipate the heat from the VRM area.
    3| The PSU is also shady and is the culprit if your system decides to croak.
    4| You shouldn't be on the stock cooler with that kind of an overclock. In fact your voltages look high. It should be around 1.25v, max at 1.28v.


    I agree all the things you've mentioned. My PC case only supports 2 fans, but I'm thinking about upgrading the case to Cougar MX330, and about the cooler I'm also thinking about upgrading it to Cooler Master Hyper 212 X. I'll try lowering the voltage to see what is stable.
    Reply to jrglol
  3. Lutfij said:
    1| The source of your issues can be a number of things. One such factor is the lack of proper airflow.
    2| The board you're working with isn't exactly geared towards overclocking since it lacks the proper heatsinks to dissipate the heat from the VRM area.
    3| The PSU is also shady and is the culprit if your system decides to croak.
    4| You shouldn't be on the stock cooler with that kind of an overclock. In fact your voltages look high. It should be around 1.25v, max at 1.28v.


    I've downclocked it to 4.2 Ghz which is the turbo speed that comes stock, the voltage that I got stable is 1.33 V. The CPU still underclocks when under load. :(
    Reply to jrglol
  4. Lutfij said:
    1| The source of your issues can be a number of things. One such factor is the lack of proper airflow.
    2| The board you're working with isn't exactly geared towards overclocking since it lacks the proper heatsinks to dissipate the heat from the VRM area.
    3| The PSU is also shady and is the culprit if your system decides to croak.
    4| You shouldn't be on the stock cooler with that kind of an overclock. In fact your voltages look high. It should be around 1.25v, max at 1.28v.


    I've found my solution! It was downclocking because I left 'pwm processor hot' on, after disabling it the CPU no longer underclocking. :)
    Reply to jrglol
  5. And your temps are?
    Reply to Karadjgne
  6. Karadjgne said:
    And your temps are?


    idle ~25c
    max 48c
    Reply to jrglol
  7. For an AMD cpu, that's not too shabby for max temps.
    Reply to Karadjgne
  8. Karadjgne said:
    For an AMD cpu, that's not too shabby for max temps.


    Technically it's not an APU, because it has a disabled GPU.
    Reply to jrglol
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