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    t400 cpu issue

    Discussion in 'Lenovo' started by megasonali, Oct 15, 2008.

  1. megasonali

    megasonali Notebook Enthusiast

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    i ordered t400 with p8400 1066Mhz processor.....but its showing as 791 both in system properties and pcwizard as well........could someone clarify me about this...
     

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    megasonali, Oct 15, 2008
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  2. leshan

    leshan Notebook Consultant

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    If you are running a havey program, you will see the different.
     
    leshan, Oct 15, 2008
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  3. pkp

    pkp Notebook Enthusiast

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    What you're seeing is simply the effect of SpeedStep. There's not always a need for your cpu to be running full tilt at 2.26ghz (the 1066Mhz figure refers not to the CPU, but the FSB, Front Side Bus).

    By lowering the speed of the CPU, it draws less power and generates less heat, which is especially important in a laptop.

    Also see: http://forum.notebookreview.com/showthread.php?t=296291
     
    pkp, Oct 15, 2008
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  4. ZaZ

    ZaZ Super Model Super Moderator

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    If you're doing Office/Internet/Music you don't need more.
     
    ZaZ, Oct 15, 2008
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  5. Agotthelf

    Agotthelf Notebook Consultant

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    Try a different program, system properties is not reliable,
    to monitor the actual cpu mhz.

    Try CPU-Z or Everest if you want a close monitoring.

    Regards
    Andreas
     
    Agotthelf, Oct 15, 2008
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  6. receph

    receph Notebook Evangelist

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    changing your power consumption profile to max. performance will remedy this, but will also clock the cpu at its max unnecessarily
     
    receph, Oct 15, 2008
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  7. jonlumpkin

    jonlumpkin NBR Transmogrifier

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    This is a designed feature and a good one. SpeedStep (Intel), and Cool & Quiet (AMD) are able to dynamically adjust the voltage of your processor to the task at hand. When your machine is idling or running a constant low speed task (playing back music/video), it is able to downvolt to about 1/3 of the rated CPU speed.

    If a high performance task needs power, the technology is able to quickly adjust the voltage (several times per second) up, and then drop it down when that task is completed. If you are just running office apps/firefox, it may only increase voltage for 1 or 2 seconds. If you are running a high performance application (audio/video editor, 3D game, etc) then it may hold the full processor speed for a very long time.

    This technology reduces power usage, and consequently yield higher battery life, and decreased heat/noise at little to no performance penalty. I even use the technology on my Desktop computer, despite the fact that battery life is not a concern.

    You should definitely use this setup (adaptive processor speed) when on AC power. When running on battery, this technology is a tradeoff. You will get good performance from SpeedStep, but if you have a misbehaving application (Firefox with a bad page, game, etc) that is requesting more power than it actually needs you will get reduced battery life compared to the default 'slow' processor setting for battery.
     
    jonlumpkin, Oct 15, 2008
    #7