Core 2 Duo Multiplier keeps jumping

Discussion in 'Processors and motherboards Intel' started by saguran, Apr 7, 2011.

  1. saguran

    saguran Active Member

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    Hi guys,

    I saw this problem since I got my pc. I have a Intel Core 2 Duo E7400 @ 2.8GHz stock. At first my CPU was underclocked for some reason, running at something like 2.2 GHz which I then fixed.

    When I'm running CPU-Z, the multiplier keeps jumping between 10.5 (2.8Ghz) and 6 (1.6Ghz). I've read that this is an energy saving technique. I apologise in advance if this is a silly question, but is there a way to turn this off so I can constantly run at 2.8Ghz? Or is that not good for the CPU or CPU life?

    Thanks
     
  2. ross

    ross Master Guru

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    saguran,

    Your multiplier keeps adjusting itself because you have C1E and EIST (Enhanced Intel Speedstep Technology) enabled in your P43 BIOS.

    Stolen from Intel @ http://www.intel.com/cd/channel/reseller/asmo-na/eng/203838.htm#overview

     
  3. saguran

    saguran Active Member

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    Thanks for the help :)
     
  4. sykozis

    sykozis Ancient Guru

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    It's better for the sake of energy conservation and temperature to leave C1E and EIST enabled.
     

  5. shimyns

    shimyns Ancient Guru

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    If u r running at stock voltage (not OCing), just leave C1E and EIST on. It keeps idle heat and voltage down and when u need more power, it'll ramp up by itself. So why change that?
    I have mine on even though I'm OCed at 4 Ghz. I have a dynamic vcore option in my bios that allows me to keep C1E and EIST on and still enjoy these power saving features despite my OCed voltage/clock. W/o this option, when u manually increase voltage but leave C1E and EIST on, the multiplier will change but voltage won't. In such a case, it's, therefore, pretty useless to keep these features enabled.
    Again, if u r running ur CPU at stock speeds/voltage, I'd just leave them on.
     

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