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    Why does CPUZ 64 bit say my core speed is 1596.04?

    Discussion in 'Dell' started by Ice Cold, Sep 23, 2009.

  1. Ice Cold

    Ice Cold Notebook Deity

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    I run CPUZ the 64-bit edition.

    it constantly fluctuates in the 1596.XX range and there are 2 cores CPUZ reports the CPU Model correctly as 45nm and T9400 2.53Ghz.

    Is this normal why does it do this?

    And also at times it shows higher speeds up to 2.66Ghz when I am running multiple HD videos

    and the VID fluctuates from 0.950 to 1.250V

    http://i42.photobucket.com/albums/e336/MikeL1/Untitled1.jpg
     
    Ice Cold, Sep 23, 2009
    #1
  2. Tinderbox (UK)

    Tinderbox (UK) BAKED BEAN KING

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    try stressing the cpu with wprime and then you will see the maximum clock speed, it is most likely underclocking itself at the moment to save power.
     
    Tinderbox (UK), Sep 23, 2009
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  3. Fragilexx

    Fragilexx Get'cha head in the game

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    Yes, exactly what Tinderbox said.

    Most modern Intel CPUs have something called speed step (or rather enhanced speed step - link). This is where your CPU is run in a low performance mode to conserve power / reduce heat. When running anything that requires more speed, the CPU will speed up to the maximum.

    With regards to it running at 2.66GHz, this is another Intel feature called IDA - or Intel Dynamic Acceleration ( link). This is where your CPU will overclock one core slightly typically when running single threaded applications or only utilising a single core.

    The VID will fluctuate as the CPU requires more power, either to employ the IDA, or to reduce speed with speed step

    Regards
     
    Fragilexx, Sep 23, 2009
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  4. Ice Cold

    Ice Cold Notebook Deity

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    OOOOoooooo good to know. I looked in the BIOS and some Googling if I disable EIST Enhanced intel speed step then I will reduce my battery effciency, but it will always run at 2.53Ghz

    I read that some people don't like this enhanced speed step.

    and even when I put the laptop on High Performance it still fluctuates down to 1596.94 but the VID remains at 1.250

    I don't get the point or reason for High performance to exists since its doing the same thing as Balanced or Dell Reccomended.
     
    Ice Cold, Sep 23, 2009
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  5. Peon

    Peon Notebook Virtuoso

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    Windows power plans are a joke. About the only thing they're good at is controlling screen brightness.

    Oh and for Dell, I believe that disabling EIST actually forces the CPU to run at the slowest possible speed, not the fastest.
     
    Peon, Sep 23, 2009
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  6. Mastershroom

    Mastershroom wat

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    ^Correct. It depends on your particular motherboard and BIOS, but my Studio 15 locks the multiplier to the lowest value if you disable SpeedStep. If you really want to lock it to your maximum speed, use RMClock to disable all multipliers except the highest, and your CPU will stay at full speed. This will generate a ton of heat, though, so be careful.
     
    Mastershroom, Sep 23, 2009
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