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Thread: How to accurately measure PC power draw

  1. #21
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    Quote Originally Posted by ashiekh View Post
    If one wants something to last it is normally a good idea to de-rate it, i.e. not run it at its full capacity.
    I see you're keeping all the myths alive.

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    Quote Originally Posted by -The_Mask- View Post
    I see you're keeping all the myths alive.
    Ah no de-rating needed with temperature

    http://power-topics.blogspot.com/200...put-power.html
    Attached Images Attached Images

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    Quote Originally Posted by turkey3_scratch View Post
    If the power supply couldn't handle its labelled wattage they wouldn't label it as that.
    And they are labeled by at what temperature they can deliver that wattage; above that temperature it needs to be de-rated.

    https://forums.anandtech.com/threads...-rated.157636/

    "Power supplies can perform differently depending on the temperature at which they are operating at. When a power supply is rated for it's total output wattage, it is rated to do so at a particular temperature. Anything beyond this temperature may take away from the power supply's capability. A power supply that is rated to put out 550W at 25°C or 30°C (room temperature) may only be able to put out 75% of that at 40°C or 50°C (actual operating temperature). This difference is called the "de-rating curve". A normal operating temperature for a power supply is 40°C."

    jonnyGURU, Mar 19, 2008


    Don't forget that they don't run on room temperature air but rather on the warmer air that comes from the computer.

    Now 40C is a hot Summer day (hotter in some places), so the supply may then be running on 50C air or hotter, and if that de-rates it to 75% then I would say it needs to be of significantly higher capacity.
    Last edited by ashiekh; 01-27-2018 at 07:49 PM.

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    Quote Originally Posted by ashiekh View Post
    Estimate it roughly then get a supply that can deliver twice as much; now you are running at the sweet spot for efficiency, the supply is not running flat out and you have room to grow. No need for accuracy.
    Yea but that's more money onto the psu so not really worth it especially if you don't pay the power bill and don't mind a loud computer

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    Quote Originally Posted by COFASA View Post
    Yea but that's more money onto the psu so not really worth it especially if you don't pay the power bill and don't mind a loud computer
    Absolutely, if you are not paying for the electricity the efficiency is less relevant, but one still needs to account for temperature de-rating and the less efficient supply runs hotter.

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    i totally agree with mask, awesome gamer and turkey scratch

    the idea of being as accurate as possible is not to make a overestimation because you will spend more money and you tradeoff idle efficiency for a bit more efficiency when running at full load

    At the end of the day it's about the same, most PSUS are very inefficient when pulling less than 20% of its rated capacity but don't run all that bad at 80-100% load

    so i will hit that >20% load more often with a oversized capacity

    And if the PC is idling most of the time then there's not efficiency benefit at all

    and yes for the same money as an oversized PSU i can get a lower wattage but higher quality PSU which will deliever cleaner power, be more efficient and quieter at the same time

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    Quote Originally Posted by ashiekh View Post
    Absolutely, if you are not paying for the electricity the efficiency is less relevant, but one still needs to account for temperature de-rating and the less efficient supply runs hotter.
    Yes but if i get a high-quality PSU that won't be a problem

    since components are made to handle high temperatures much better and also provide better airflow due to their fan design and efficiency

    i guess that's why units like the seasonic PRIME titanium 650W exist

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    I stand corrected.

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    Quote Originally Posted by ashiekh View Post
    I stand corrected.
    anyway thanks for your help

    but my main concern is how do I find out how much power I actually need

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    Quote Originally Posted by COFASA View Post
    Yes but if i get a high-quality PSU that won't be a problem since components are made to handle high temperatures much better and also provide better airflow due to their fan design and efficiency
    High quality power supplies are not de-rated with temperature?
    Last edited by ashiekh; 01-27-2018 at 06:50 PM.

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