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    VAIO Z Speedstep

    Discussion in 'VAIO / Sony' started by 10101, Aug 4, 2009.

  1. 10101

    10101 Newbie

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    Hi,

    I just run some test on my my Z46 (P9700 2.8Ghz) and found there is something unusual. Hope someone can explain this.

    I set the Vista power manager profile to high performance which suppose to give me the max speed of the CPU settings and I check with CPU-z and the reading was 2793.2Mhz which is correct ... however when I try to run some CPU stress test it CPU-z shows the multiplier jump back to x6 (suppose 10.5)
    and the core speed reduce to 1.6Ghz. And then I start notice whenever I have the CPU on full load it will switch to 1.6 Ghz instead of 2.8Ghz...

    I tried it with different software and same happen.. I also monitor the temperature and it's only 65-68 which is normal to me...

    I just can't figure out why the CORE speed would drop when it suppose demand the highest speed..

    Is it just my Z46 or anything have the same happen ?... :confused:
     
    10101, Aug 4, 2009
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  2. zephir

    zephir Notebook Deity

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    There has been reports of Z-series laptops that throttle CPU once a certain temperature threshold is reached. This is a feature almost all laptops have. However, the temperature threshold for the Z is a little low. I think you can change it in BIOS.
     
    zephir, Aug 4, 2009
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  3. Jparity

    Jparity Notebook Evangelist

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    65- 68 is A LITTLE low?... When I was doing stress test on my P9600 prior to undervolting, it reached and stayed around 81 degrees at full throttle.

    After undervolting, now the max temperature under full throttle is around 65.

    I've never seen the thermal control throttling my clock speed. Unless you didn't set the fan to performance mode during the stress test?
     
    Jparity, Aug 4, 2009
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  4. 10101

    10101 Newbie

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    65-68 was at the beginning of the stress test and whenever I try to run any program with full load... as soon as I start these program the core speed just drop to 1.6 Ghz straight away...
     
    10101, Aug 4, 2009
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  5. NHT

    NHT Notebook Evangelist

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    I hope you didn't run in Silence mode
     
    NHT, Aug 4, 2009
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  6. Jparity

    Jparity Notebook Evangelist

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    Yea I second that.. Also, which program do you use for your stress test?
     
    Jparity, Aug 4, 2009
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  7. zephir

    zephir Notebook Deity

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    Okay, maybe that's too low for throttling to kick in ;) , but as somebody said, maybe the laptop is set to run in silent mode, as such, the fan is set to a low rpm, to stay silent.
     
    zephir, Aug 5, 2009
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  8. 10101

    10101 Newbie

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    Guys,

    You were right...
    I thought the SONY power management is same as the vista one.... I just double check and it was on silent mode ... DOH......

    thx for all the advice...
     
    10101, Aug 5, 2009
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