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Thread: How to accurately measure PC power draw

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    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.

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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.
    Lul, that's not a great idea, especially as most PCs spend a lot of time at idle where a smaller PSU is more efficient. If you aren't using a HEDT CPU, 2 or more GPUs or an AMD Vega on liquid then 550w should be enough, 650 if you want to be careful...

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    My PCs consume a little over 100W when working, so I am happy with the 250/300W supplies they have. I would not like to go smaller for efficiency.
    Last edited by ashiekh; 01-26-2018 at 11:32 PM.

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    There isn't really a choice because you can't buy a good PSU under 300W in retail. So for you it makes sense to buy an overkill power supply. But saying that he needs to buy a PSU that's double the power of what's he need because of the better efficiency is just a myth and bad advise.

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    Quote Originally Posted by COFASA View Post
    But i guess you need expensive equipment for that isn't it?
    You need to make it yourself, it's not something that you can buy.

    AX power supplies can measure power draw per connector but you have to own one and I just want to learn how to do it for PSU purchase
    That's the AXi.

    But for many components you can make a good estimation, by looking at similar products.

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    Quote Originally Posted by -The_Mask- View Post
    There isn't really a choice because you can't buy a good PSU under 300W in retail. So for you it makes sense to buy an overkill power supply. But saying that he needs to buy a PSU that's double the power of what's he need because of the better efficiency is just a myth and bad advise.
    The efficiency curve doesn't peak around the middle?

    http://www.corsair.com/en-us/blog/20...e-power-supply
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    Last edited by ashiekh; 01-27-2018 at 06:31 AM.

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    By most power supplies it does, but that doesn't make it true. A normal PC isn't continues working at 100% load, is normally more idle. And even with gaming the components won't continues take full power. Buying a PSU that can deliver double the power then you need, also will cost you more money, something you won't get back in efficiency.

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    Quote Originally Posted by -The_Mask- View Post
    There isn't really a choice because you can't buy a good PSU under 300W in retail. So for you it makes sense to buy an overkill power supply(...).
    And if you want a non group regulated (DC-DC instead) I think is difficult to find under 400W
    Edit: AFAIK Antec VPF 350 is one of the smaller wattage in DC DC regulated
    Last edited by ManoloKosh; 01-27-2018 at 07:42 AM. Reason: Add 350W exampl6

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    Quote Originally Posted by -The_Mask- View Post
    Buying a PSU that can deliver double the power then you need, also will cost you more money, something you won't get back in efficiency.
    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 also don't run a cooling system at home in the Summer, so one might argue that the de-rated supply will pay for itself rather quickly in saved cooling bills.

    So I am quite happy to be running my supplies at around half load, but if you want to run yours nearer full load during the Summer that is a choice.
    Last edited by ashiekh; 01-27-2018 at 12:00 PM.

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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 also don't run a cooling system at home in the Summer, so one might argue that the de-rated supply will pay for itself rather quickly in saved cooling bills.

    So I am quite happy to be running my supplies at around half load, but if you want to run yours nearer full load during the Summer that is a choice.
    If you want your power supply to last you should just get a higher quality power supply rather than a higher wattage power supply. The higher wattage one usually just has a few more capacitors, some rectifiers that can handle more current, and other minor changes. If the power supply couldn't handle its labelled wattage they wouldn't label it as that.

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