The Notebook Review forums were hosted by TechTarget, who shut down them down on January 31, 2022. This static read-only archive was pulled by NBR forum users between January 20 and January 31, 2022, in an effort to make sure that the valuable technical information that had been posted on the forums is preserved. For current discussions, many NBR forum users moved over to NotebookTalk.net after the shutdown.
Problems? See this thread at archive.org.
← Previous page

    RM Clock alternatives for undervolting P8400/P8600?

    Discussion in 'Hardware Components and Aftermarket Upgrades' started by Phil, Aug 23, 2008.

  1. 0.0

    0.0 Notebook Consultant

    Reputations:
    87
    Messages:
    237
    Likes Received:
    0
    Trophy Points:
    30
    I just clicked "unlock voltage control". It's possible to add extra multi's and voltages outside spec as can be seen below but of course even though they can be selected the cpu will stick to it's limits, at least with the P8400 anyways.
     

    Attached Files:

    • nhc.png
      nhc.png
      File size:
      19.6 KB
      Views:
      410
    0.0, Aug 10, 2009
    #51
  2. Gossling

    Gossling Notebook Guru

    Reputations:
    0
    Messages:
    65
    Likes Received:
    0
    Trophy Points:
    15
    Hmm, your program interface is different from mine. You're have 2.0.7.3 which only runs on Vista, right? I am using XP Pro and have the 2.0 bugfix Dell version. I can't find an option to allow me to enable voltage control. Has anyone been able to undervolt the Latitude E6400 with a P8400 successfully? RMClock doesn't recognize half multipliers, so I've eliminated that option. CrystalCPUID didn't lower my voltages at all. CPUGenie kept crashing and didn't seem to lower voltages either. I cannot find a proper solution...
     
    Gossling, Aug 10, 2009
    #52
  3. sgogeta4

    sgogeta4 Notebook Nobel Laureate

    Reputations:
    2,389
    Messages:
    10,552
    Likes Received:
    7
    Trophy Points:
    456
    Losing the half multiplier is well worth it to undervolt in RMClock IMO.
     
    sgogeta4, Aug 10, 2009
    #53
  4. 0.0

    0.0 Notebook Consultant

    Reputations:
    87
    Messages:
    237
    Likes Received:
    0
    Trophy Points:
    30
    I did have, it's expired now and yes it was for Vista 32-bit IIRC. Hopefully a new version will be released soon :)
     
    0.0, Aug 10, 2009
    #54
  5. Dev1ant

    Dev1ant Notebook Consultant

    Reputations:
    40
    Messages:
    134
    Likes Received:
    0
    Trophy Points:
    30
    Not to bring up an old thread without reason, I've found CPUGenie to be VERY useful. It seems I can set the voltage for my P8400 at the SLFM voltage of 0.875v after ticking the "unlock voltage" thing. I'm currently in the process of testing the voltages at difference frequencies and I'm currently at a 6.5x multi at 0.875v. CPU-Z agrees with the voltage as well.
     
    Dev1ant, Aug 28, 2009
    #55
  6. alanfly

    alanfly Newbie

    Reputations:
    0
    Messages:
    2
    Likes Received:
    0
    Trophy Points:
    5
    I have also used the CPUGenie on my p8400,and i could choose the voltage below 0.9V afther clicked on the unlock the voltage.But when i saw the monitor and cpu-z,it always showed 0.9V even i chose the voltage under 0.9V.
     
    alanfly, Aug 31, 2009
    #56
  7. Dev1ant

    Dev1ant Notebook Consultant

    Reputations:
    40
    Messages:
    134
    Likes Received:
    0
    Trophy Points:
    30
    Did you make sure your voltage is correctly entered? I found the software to be clunky in terms of accepting input values and the like. It should implement an "Apply" button because after changing voltage values ,I pressed enter literally 15 times to ensure it's applied.
    Maybe it's a hardware limit and your chip at most could only use 0.9v? It's because 0.875 works great as does .887v.

    It changes it correctly and CPU-Z as well as CPUGenie's monitor report the correct voltages. When it loads up at 2.26GHz, I see the voltage change to .925v and drops back down to .875v at 1.6GHz.
     
    Dev1ant, Sep 1, 2009
    #57
  8. alanfly

    alanfly Newbie

    Reputations:
    0
    Messages:
    2
    Likes Received:
    0
    Trophy Points:
    5
    I tried again,but it didn't change.Maybe it's the hardware limit and you are lucky. :)
     
    alanfly, Sep 2, 2009
    #58
← Previous page