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Thread: Very quiet PSU around 400W for a workstation (70€)

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    Quote Originally Posted by ashiekh View Post
    So the lifespan in that case is fixed and would not be extended by running it below the maximum output?
    See, that is the Problem.
    We don't know where the Weak/Breaking point of the PSU is.
    In the last couple of days it seems that it could be the +5VSB Standby Controller.
    Or maybe its some darn Resistor? Maybe a Diode or a Transistor? The SOT23 ones not the big TO-220 or 247...

    Just to overrate the PSU doesn't seem to make too much sense...

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    https://en.wikipedia.org/wiki/Derating

    "
    In electronics, derating (or de-rating) is the operation of a device at less than its rated maximum capability in order to prolong its life. Typical examples include operation below the maximum power rating, current rating, or voltage rating.
    "
    Last edited by ashiekh; 08-11-2018 at 06:53 PM.

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    Yes and??
    In some (many) cases many of the components used in a 450 and an 850W PSU is the same, the same Electrolytic capacitors, the same ICs, the same +5VSB controller.

    If either of those things is the weak point, what good does the fatter primary MOSFETs do??

    And that's the point, you don't know where the problem lies and if the 850W will last longer than the 450W...

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    Let us agree to disagree; I will derate, you will not.
    Last edited by ashiekh; 08-12-2018 at 12:05 AM.

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    Quote Originally Posted by ashiekh View Post
    Let us agree to disagree; I will derate, you will not.
    An example then:

    A person seeks a PSU, he has a gaming PC that pulls around 300W average out of his PSU under full load. That's probably something like a GTX 1070 or GTX 1080 which needs two PEG connectors, the CPU is a non overclocked i5, i7, Ryzen 5 or 7. He isn't planning to overclock, also no upgrades. So a high quality 400/450W PSU makes sense here.

    In this case your choice would be the 600/650W version of the same power supply, right? So that the power supply isn't heavily loaded. The thing is the components that matter are probably the same. The components that did change where the 12V MOSFETs, but those were already heavily overrated in the first place. Those aren't expected to die first. And because most other components are similar or exactly the same nothing really changed to the better for the lifetime of the PSU.

    What would have helped is a power supply that has better components everywhere, not just on a single or a couple of places which won't make a difference. So don't spent money on a higher wattage if you don't need. Because it's much more useful to spent it on a better quality power supply. That's actually gonna help.

  6. The Following User Says Thank You to -The_Mask- For This Useful Post:

    COFASA (08-12-2018)

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    I agree, don't get claimed capacity at the price of quality; but that is a separate discussion.

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    Quote Originally Posted by -The_Mask- View Post

    What would have helped is a power supply that has better components everywhere, not just on a single or a couple of places which won't make a difference. So don't spent money on a higher wattage if you don't need. Because it's much more useful to spent it on a better quality power supply. That's actually gonna help.
    I agree, most arguments for purchasing an overkill PSU make no sense

    "A higher wattage PSU will be more efficient" "it will be quieter" "it will last longer"

    just get a better overall PSU and that's it. No matter if it's 350 or 400W, as long as you have enough wattage it'll be OK

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    Strange that

    http://www.jonnyguru.com/forums/show...9&postcount=18

    is getting a life of 0.5-1 year when running supplies at 90-95% load

    I would imagine they would last longer a half load...

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    Quote Originally Posted by -The_Mask- View Post
    he thing is the components that matter are probably the same. The components that did change where the 12V MOSFETs, but those were already heavily overrated in the first place.
    Well, in case of the RM550x/650i...

    https://www.tomshardware.com/reviews...ly,4484-3.html
    https://www.techpowerup.com/reviews/.../RM650i/5.html

    Both use the same +12V MOSFETs and also the same Amount.
    Differences are more on the Primary Side...

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    Going back to your suggestions I got:

    - be quiet! Pure Power 10 400W
    - Bitfenix Formula Gold 450W

    https://www.globaldata.pt/componente...0-silver-bn272
    https://www.globaldata.pt/componente...p-fm450ulag-9r


    Problem with these is that stock for this brands is hard. Does anyone have other suggestions from the brands available at this store that are quiet and within my budget? Corsair, Cooler Master or Seasonic for example: https://www.pcdiga.com/fontes-de-alimentacao
    Last edited by cifroes; 09-30-2018 at 05:41 PM.

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