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    Undervolting P8400

    Discussion in 'Hardware Components and Aftermarket Upgrades' started by T-100000000, Feb 3, 2009.

  1. T-100000000

    T-100000000 Notebook Enthusiast

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    Hi,

    I am a long time reader of this forum but a first time poster.
    Lately i have been reading about undervolting and what advantages it could have on my laptop. I have come across to see that RM clock will only recognize the P8400 underclocked. I would be happy using the processor at approximately 2.1ghz with lower temps.

    The question that i would like to ask:

    Has anyone managed to undervolt the P8400? Since the P series processors use low voltage already, does undervolting make adequate difference?


    My laptop Specs:
    HP DV5
    Vista Ultimate 32 bit
    P8400
    4gb DDR2 667
    9600M GT
     
    T-100000000, Feb 3, 2009
    #1
  2. SpeedyMods

    SpeedyMods Notebook Deity

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    I undervolted my P8400, lost 133mhz, but it runs cooler.

    It undervolted to the minimum voltages for every multiplier.

    Greg
     
    SpeedyMods, Feb 3, 2009
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  3. T-100000000

    T-100000000 Notebook Enthusiast

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    Thanks for the reply!
    Is it 100% stable? Have you had any errors in RM clock or bsod?

    I was thinking to undervolt and then maybe overclocking my gpu.
     
    T-100000000, Feb 4, 2009
    #3
  4. SpeedyMods

    SpeedyMods Notebook Deity

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    I haven't had any errors whatsoever.

    Greg
     
    SpeedyMods, Feb 4, 2009
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  5. T-100000000

    T-100000000 Notebook Enthusiast

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    I have just undervolted my dv5t!
    Just like you, i undervolted to the minimum voltage on all multipliers.
    I ran the cpu stress test for over 3 hours and not a single problem/error has occurred.

    Here are my results:
    Tested with Zalman NC1000 on max
    Ambient Temperature: 30 Degrees Celsius

    Before:
    Core #0- 65 degrees
    Core #1- 66 degrees
    GPU- 56 degrees
    HDD- 42 degrees


    After:
    Core #0- 51 degrees
    Core #1- 50 degrees
    GPU- 53 degrees
    HDD- 40 degrees


    As you can see from my results, undervolting has made a significant difference!
     
    T-100000000, Feb 4, 2009
    #5
  6. slander

    slander Notebook Guru

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    Sorry for bumping this thread, but I am in the search for the best undervolt for my P8400 in my Latitude E6400.

    So you bought an aftermarket cooler for your laptop, T-100000000?
     
    slander, Apr 27, 2009
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  7. Chango99

    Chango99 Derp

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    Follow the undervolting guide, and yes, he had a Zalman NC1000.
     
    Chango99, Apr 27, 2009
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