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Thread: Does power supply performance 'decrease' over time?

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    Default Does power supply performance 'decrease' over time?

    Does power supply performance 'decrease' over time?
    If it happens, then
    > Is it notable?
    > Why does that happen?

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    Quote Originally Posted by rgbodosk View Post
    Does power supply performance 'decrease' over time?
    Maybe...
    If it happens, then
    > Is it notable?
    Depends...
    > Why does that happen?
    Varies on each platform

    Here's a good read over at [H]ard|OCP

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    Quote Originally Posted by rgbodosk View Post
    Does power supply performance 'decrease' over time?
    If it happens, then
    > Is it notable?
    > Why does that happen?

    The secondary capacitors may age and so more ripple may get through.

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    Quote Originally Posted by ashiekh View Post
    The secondary capacitors may age and so more ripple may get through.
    That's one failure/degradation mode. I've also had various coils fail/degrade in oddball ways - albeit not recently. Coil construction and packaging has improved greatly over the years.

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    Quote Originally Posted by rgbodosk View Post
    Does power supply performance 'decrease' over time?
    I haven't found any evidence for this claim, on the contrary.

    The only Supporting fact that might support that is a Capacitor Datasheet, what the Manufacturers state about the Lifetime of Capacitors. That might be the reason for this fairy tales existance.

    It is only told in the Angelo-Saxon space, not in the German Sphere (well, they had me).


    So that is not a regular occurance but a technical defect that could happen and influence the regulation of the unit.

    Quote Originally Posted by rgbodosk View Post
    If it happens, then
    > Is it notable?
    > Why does that happen?
    a) it usually doesn't. Other things usually happen before that
    b) if the right part dies, it might be
    c) wear and tear due to normal use.


    In the end its just some claim from some people who thought they know what they are talking about but really didn't.

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    Quote Originally Posted by Stefan Payne View Post
    In the end its just some claim from some people who thought they know what they are talking about but really didn't.

    I have repaired MANY power supplies for computers and monitors by replacing secondary capacitors;
    of course my view is biased as I was given the units exactly because they were broken, and the
    capacitor plague only made the problem worse.

    I keep the failed capacitors in a box for fun.

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    Quote Originally Posted by ashiekh View Post
    I have repaired MANY power supplies for computers and monitors by replacing secondary capacitors;
    of course my view is biased as I was given the units exactly because they were broken, and the
    capacitor plague only made the problem worse.

    I keep the failed capacitors in a box for fun.
    Ähm, I think we are talking past each other.
    I wasn't talking about Capacitors or what they do or don't do.

    The "PSU Degrading" Claim is that the PSU loses wattage over time for whatever reason.
    Usually the Claim is 25% or whatever they feel like it. For a long time the "beloved" Outervision PSU Calculator also propagated this nonsense as well.

    Anyway, there are the HardOCP Reviews on one hand and an older Computerbase Review made by Philip that show that PSU don't degrade over time. Ripple might get worse, yeah, maybe but that's about it. They do not lose capacity at all! They are all still able to do their rated Wattage at full load (and room temperature)...
    https://www.computerbase.de/2013-11/...etzteile-test/

    Not that I would advocate for using such old PSU with modern Components anyway...

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    Quote Originally Posted by Stefan Payne View Post
    I haven't found any evidence for this claim, on the contrary.

    The only Supporting fact that might support that is a Capacitor Datasheet, what the Manufacturers state about the Lifetime of Capacitors. That might be the reason for this fairy tales existance.

    It is only told in the Angelo-Saxon space, not in the German Sphere (well, they had me).


    So that is not a regular occurance but a technical defect that could happen and influence the regulation of the unit.


    a) it usually doesn't. Other things usually happen before that
    b) if the right part dies, it might be
    c) wear and tear due to normal use.


    In the end its just some claim from some people who thought they know what they are talking about but really didn't.
    OK. Then why bother with a warranty?
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    Quote Originally Posted by Stefan Payne View Post
    Ähm, I think we are talking past each other.
    I wasn't talking about Capacitors or what they do or don't do.

    Ah, my bad.

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    Quote Originally Posted by ashiekh View Post
    Ah, my bad.
    Shit happens, no hard feelings...

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