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    CPU throtles on AC

    Discussion in 'Hardware Components and Aftermarket Upgrades' started by nu_D, Oct 9, 2010.

  1. nu_D

    nu_D Notebook Deity

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    I bought an aftermarket ac adapter but whenever I'm using it, the CPU tends to clock down to 400mhz or so. I wasn't sure what was going on I thought it was software at first, because windows was so bloody slow, but I opened cpu-z and noticed how slow the CPU was running.

    Why would the ac adapter be causing this to happen? It doesn't happen on the stock ac adapter or on battery.
     
    nu_D, Oct 9, 2010
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  2. sean473

    sean473 Notebook Prophet

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    Obviously its not providing enough power to the CPU... you should have bought an OEM adapter.
     
    sean473, Oct 9, 2010
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  3. thinkpad knows best

    thinkpad knows best Notebook Deity

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    Lol, or he's just using a "Max Battery" energy use profile when on AC, i use a low energy profile on my W700 and never notice (in everyday applications/use) any difference between if my T9600 was at 2.8 or 840 (lowest stock multiplier), i only keep my CPU on it's lowest speed step for heat reasons (prolong thermal paste lifetime, unecessary energy use, heat.
     
    thinkpad knows best, Oct 9, 2010
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  4. nu_D

    nu_D Notebook Deity

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    No...settings are the same.
    On the OEM AC it runs fine, on battery runs fine, only on the after-market AC does it happen.

    I guess it makes sense that it can't supply enough power...
    Thanks.
     
    nu_D, Oct 10, 2010
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  5. Judicator

    Judicator Judged and found wanting.

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    Well, unless it's not running up to specifications, it's easy enough to check. What wattage rating is your OEM AC adaptor, and what wattage rating is the aftermarket one?
     
    Judicator, Oct 10, 2010
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  6. nu_D

    nu_D Notebook Deity

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    Both 90w. It's basically an exact replica...that's why I initially didn't think it was that. But it must be some defect in the after-market one, as on battery or the OEM one there are no issues whatsoever.
     
    nu_D, Oct 10, 2010
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  7. Meaker@Sager

    Meaker@Sager Company Representative

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    I recommend Coolermasters slim 95W 3rd party charger.
     
    Meaker@Sager, Oct 10, 2010
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  8. Judicator

    Judicator Judged and found wanting.

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    Mm. Yes, then either the aftermarket one isn't up to spec, or maybe the connector tip doesn't fit quite right and isn't providing full power. There's probably no way to tell for sure without getting some sort of monitor on the power adaptors.
     
    Judicator, Oct 10, 2010
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  9. sean473

    sean473 Notebook Prophet

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    Obviously your adapter is fail.. u should use the OEM one..
     
    sean473, Oct 10, 2010
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  10. tilleroftheearth

    tilleroftheearth Wisdom listens quietly...

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    Did you try to see if the adaptor powers the notebook properly when the battery is out?

    It just may not be powerful enough to both charge and power the notebook?

    Even if it is able to work without the battery inside, I would still not use it on any notebook of mine (only OEM for me - the risks are too great otherwise).

    Good luck.
     
    tilleroftheearth, Oct 11, 2010
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  11. John Ratsey

    John Ratsey Moderately inquisitive Super Moderator

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    I don't have hands-on experience of HP but Dell uses the centre pin of the PSU DC plug to detect the capacity rating of the PSU. If the pin is absent or the PSU does not include the requisite chip then the CPU will be throttled by the BIOS.

    John
     
    John Ratsey, Oct 11, 2010
    #11