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Thread: psu continuous output degrade?

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    Default psu continuous output degrade?

    This is a different question from last time(performance degrade).


    1. What is actually considered when manufacturers 'labeling' output wattage? Is it really just depending on 'internal' factors?

    2. What do you think about this phrase - 'psu continuous output degrade over time(ex. 0y 600w 5y 550w 10y 450w)' ? Further explanations would be great.

    3. Does we really have to care about passing time vs power output?

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    • It also depends on ambient temperature, which is an external factor.
    • Might be argued that the secondary capacitors age and so are less good at smoothing out ripple (they dry out and their resistance increases so they run hotter).
    • If you run a supply at its maximum it will age faster than otherwise.


    Nothing lasts forever, everything degrades; I'd not worry too much about the 2nd law of thermodynamics.

    But a supply that lasts 20 years is a joy; one that lasts 2 years, not so much.
    Last edited by ashiekh; 05-18-2019 at 12:48 PM.

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    I was only talking about output here(not performance).
    Last edited by rgbodosk; 05-18-2019 at 02:17 PM.

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    It will probably be able to output its full rated power till the day it dies... unless the fan is in trouble or the ambient temperature too high, then it will trip the over-temperature protection; dust buildup also does not help.

    I am one who does not run room cooling during the Summer, so I expect my power supplies to be able to handle it. Modern server rooms tend to also be run hotter than they used to be (to save on cooling costs), sometimes to the point where it is too hot for people.

    http://www.itwatchdogs.com/environme...erature-546783

    "
    Google has stated that it keeps its data center temperatures as high as 80 degrees Fahrenheit as a means to reduce energy consumption.

    "

    I expect my own equipment to keep running even when the room temperature is 100F or more.

    https://www.datacenterknowledge.com/...s-keep-humming

    "
    Dell recently said it would warranty its servers to operate in environments as warm as 45 degrees C (115 degrees F).
    "
    Last edited by ashiekh; 05-22-2019 at 05:40 PM.

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    https://www.computerbase.de/2013-11/...zteile-test/3/
    Did all samples passed the full load?

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    Quote Originally Posted by rgbodosk View Post
    1. What is actually considered when manufacturers 'labeling' output wattage? Is it really just depending on 'internal' factors?
    2. What do you think about this phrase - 'psu continuous output degrade over time(ex. 0y 600w 5y 550w 10y 450w)' ? Further explanations would be great.
    3. Does we really have to care about passing time vs power output?
    1. rated Wattage at the rated Ambient. That depends on the component choice and fan speed.
    2. Bullshit/a Myth. If they degrade, they are dying. And also there is no rule for that. Either it does work at 100% load after a couple of years or it doesn't.
    3. Yes, because things Change and there is wear and tear, PSU might die soon anyway. For old PC it might be OK to continue using the PSU but if you replace major Components, replace the PSU as well.
      There was no point in time where you could use 10 Year old PSU with (at the time) new Hardware.


    Quote Originally Posted by rgbodosk View Post
    https://www.computerbase.de/2013-11/...zteile-test/3/
    Did all samples passed the full load?
    No, one was pretty much dead and had swollen caps.
    That might be what people mean when they claim "PSU Degrade" -> Caps get worse and then they think that the PSU loses power.

    But well, you shouldn't use a PSU with dying caps anyway.

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    Quote Originally Posted by rgbodosk View Post
    https://www.computerbase.de/2013-11/...zteile-test/3/
    Did all samples passed the full load?

    Some supplies just can't deliver the rated power, even when new

    https://www.youtube.com/watch?v=JP8n...ature=youtu.be

    and thanks again to whomever it was that identified the music

    https://www.youtube.com/watch?v=rG6R...ature=youtu.be
    Last edited by ashiekh; 05-19-2019 at 05:35 PM.

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    Quote Originally Posted by ashiekh View Post
    Some supplies just can't deliver the rated power, even when new
    yeah, but in that Computerbase Review, they used Enermax Liberty, Corsair HX IIRC and be quiet E5 and P7.
    They should do 100% load at at least 40C Ambient.

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    "There was no point in time where you could use 10 Year old PSU with (at the time) new Hardware."

    i'm running an 11+ year old psu. the current atx standard hasnt changed for yonks. 3.3, 5, 12 V rails. as stated by others the wearing out factor is variable. psu's with fanless/low rpm fan modes probly adding years to the life of the fan too in good psu's.

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    Quote Originally Posted by adamsleath View Post
    "There was no point in time where you could use 10 Year old PSU with (at the time) new Hardware."

    i'm running an 11+ year old psu. the current atx standard hasnt changed for yonks. 3.3, 5, 12 V rails. as stated by others the wearing out factor is variable. psu's with fanless/low rpm fan modes probly adding years to the life of the fan too in good psu's.
    Agree, to the extent that your computer ran with a low-enough power draw that the fan never turned on. That may happen with a system that has an integrated GPU. But beyond 10y it gets iffy. Caps and other components, per report, degrade. Of course, with a 12y warranty, one would expect a PSU to last that long. But none of the 10y-warrantied PSUs have reached their warranty limits, much less the 12y-warrantied PSUs. So the verdict has yet to arrive.
    CPU: Core i7 8700k, HT enabled, all 6 cores OC'd to 4.8GHz, Vcore = 1.24v
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