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    Undervolting the T400, possible?

    Discussion in 'Lenovo' started by grkn, Sep 26, 2008.

  1. grkn

    grkn Notebook Consultant

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    Is this possible, or will it be possible?

    Cheers,
    Johan
     
    grkn, Sep 26, 2008
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  2. John Ratsey

    John Ratsey Moderately inquisitive Super Moderator

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    Give RMclock a try although it doesn't work perfectly with the new hardware (my experience is with the Dell E6400). For example, it can't handle the half clock multiplier of the P8400 but is OK with the P8600.

    How much you will get from undervolting depends on the pre-set voltages of your CPU. My P8600 is 0.925V (6x LFM) to 1.1375V (9x). Dropping the latter to 1.05V dropped the maximum temperature a few degrees.

    What CPU and voltages do you have?

    John
     
    John Ratsey, Sep 26, 2008
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  3. grkn

    grkn Notebook Consultant

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    I have the P8400, and according to RM clock it draws 0.9875V at 6x and 1.2875V at 8x :|

    I guess there's nothing I can do with it ATM?
     
    grkn, Sep 26, 2008
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  4. John Ratsey

    John Ratsey Moderately inquisitive Super Moderator

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    Make sure you select mobile CPU on the advanced settings page then restart RMclock. The 9x voltage is very high but it may be the IDA voltage.

    Anyway, give RMClock a try (see the undervolting guide). You lose the half multipliers and IDA (no big loss) but I understand it otherwise works.

    John
     
    John Ratsey, Sep 26, 2008
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