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.

    Undervolting a T9400 cpu on a T400?

    Discussion in 'Lenovo' started by Ahbeyvuhgehduh, Feb 24, 2011.

  1. Ahbeyvuhgehduh

    Ahbeyvuhgehduh Lost in contemplation....

    Reputations:
    574
    Messages:
    775
    Likes Received:
    0
    Trophy Points:
    30
    Hello all. As I mentioned in a recent thread I recently received a "hand-me-down" T400 which I have since put win 7 pro x64 on.

    Anyway, a mod in here suggested I might undervolt the T9400 cpu and get a little extra battery life and heat control as well.

    I am very leary about "tinkering" with comp hardware like this, so I thought I would ask if anyone else in here has done this and could share the voltage settings they use that have worked and are stable.

    Many thanks in advance.

    If it helps any the specific T400 model is 2767-2JU.
     
    Ahbeyvuhgehduh, Feb 24, 2011
    #1
  2. Tsunade_Hime

    Tsunade_Hime such bacon. wow

    Reputations:
    5,413
    Messages:
    10,711
    Likes Received:
    1,204
    Trophy Points:
    581
    Tsunade_Hime, Feb 24, 2011
    #2
  3. Ahbeyvuhgehduh

    Ahbeyvuhgehduh Lost in contemplation....

    Reputations:
    574
    Messages:
    775
    Likes Received:
    0
    Trophy Points:
    30
    Thank you for responding so quickly! :D

    I have seen the page and read through it briefly, but I was hoping that someone could already give me voltage values that they have come to that worked. I am very nervous about tinkering and testing the hardware via the BSOD method.... :(

    15c is great heat reduction, by the way!
     
    Ahbeyvuhgehduh, Feb 24, 2011
    #3
  4. Tsunade_Hime

    Tsunade_Hime such bacon. wow

    Reputations:
    5,413
    Messages:
    10,711
    Likes Received:
    1,204
    Trophy Points:
    581
    Ah, well every processor is different unfortunately. Though Intel assigns a range of acceptable voltages, each one is different. Gotta trial and error on this one!

    I tend to find older Meroms greatly benefit from RMClock, while newer Penryn don't benefit as much as they are already lower wattage and generate less heat.
     
    Tsunade_Hime, Feb 24, 2011
    #4
  5. miro_gt

    miro_gt Notebook Deity

    Reputations:
    433
    Messages:
    1,748
    Likes Received:
    4
    Trophy Points:
    56
    ^ all benefit from undervolting, no matter the CPU series.

    I've switched from RMClock to ThrottleStop - the last uses less CPU power to operate as a process, or in other words you gain performance somewhat as well :D

    My new Penryn CPU went from 1.137V to 1.025V at normal x13 mode. The IDA mode requires 1.075V to operate, so it's not just a step above the previous multiplier. Cant tell why that is, so I'm currently not using it. I also dont use the lower normal multipliers, but all those undervolt with a step down in voltage from the x13 multiplier.
     
    miro_gt, Feb 25, 2011
    #5
  6. Frostyeel

    Frostyeel Notebook Enthusiast

    Reputations:
    0
    Messages:
    10
    Likes Received:
    0
    Trophy Points:
    5
    The really nice thing about using ORTHOS to stress test your cpu is that you really don't need to worry that much about getting a BSOD because ORTHOS will detect a hardware failure and halt the test.
     
    Frostyeel, Feb 25, 2011
    #6