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    Running a PC power supply on DC

    I believe older PC power supplies would probably have no problem running on 400 Hz mains (as found on ships) or even 140 V DC from batteries if push came to shove, but how would modern PC power...
  2. Let's say your RAID is going to consume at least...

    Let's say your RAID is going to consume at least 600W, for why else would you get such a powerful power supply, then if run 24/7 that will cost you around $600 a year in electricity, something to...
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    Are the factories ramping back up?

    Are the factories ramping back up?
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    Couldn't find the price of the Seasonic fanless...

    Couldn't find the price of the Seasonic fanless offerings.

    https://seasonic.com/prime-fanless-tx
  5. If the diagram is not enough, you might want to...

    If the diagram is not enough, you might want to get someone to help.
  6. Do you have a voltmeter? if so you could check...

    Do you have a voltmeter? if so you could check the voltages to see if they are what they should be before plugging it in.
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    The warranty option is not a route you would...

    The warranty option is not a route you would consider?

    I know this is not what you asked, but seems a possible solution to your situation.


    P.S. I'm also a Brit.
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    I don't think coil whine means it is going to...

    I don't think coil whine means it is going to fail, so if you can live with it, stick with it.

    Or if you are good with electronics you might want to add some coil lacquer...
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    If your socket meter reads 466W and the...

    If your socket meter reads 466W and the efficiency is say 90% around full load, then it is actually only delivering
    420W, so there is already some headroom built in by ignoring this.
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    Looks like he has a video card. Maybe that has...

    Looks like he has a video card.

    Maybe that has its own BIOS update
    https://www.techpowerup.com/vgabios/192057/xfx-rx570-4096-170419
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    It failed to see the graphics card 2 times out of...

    It failed to see the graphics card 2 times out of 5, so I considered that a bug.
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    What version are you on?

    What version are you on?
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    Have you checked for a BIOS update? ...

    Have you checked for a BIOS update?

    https://www.dell.com/support/home/us/en/04/drivers/driversdetails?driverid=8wycn&oscode=wt64a&productcode=optiplex-7020-desktop
  14. Those decoupling/bypass capacitors are already on...

    Those decoupling/bypass capacitors are already on the mother board (closer to where they are needed) and so are not necessary in the cable; another problem is that large capacitors have significant...
  15. It is the mother board that varies the load, not...

    It is the mother board that varies the load, not the power supply, so that is where the capacitors should be.

    If the frequency of change is around 1 GHz then light can only travel 1 ft in a period...
  16. Thread: PSU shelf life

    by ashiekh
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    Ah! that would explain a lot.

    Ah! that would explain a lot.
  17. Thread: PSU shelf life

    by ashiekh
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    746

    You replaced the capacitors?

    You replaced the capacitors?
  18. Thread: PSU shelf life

    by ashiekh
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    I agree, although I am not sure this would be...

    I agree, although I am not sure this would be true at full load (24/7), server power supplies aside; but I would be happy to be shown wrong. (Capacitor self heating goes like the ripple current...
  19. Thread: PSU shelf life

    by ashiekh
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    My point was just that a 10 year warranty may not...

    My point was just that a 10 year warranty may not mean there is a good chance it can last 10 years (24/7) at full load, just that you can get a replacement.

    If you are running a server, get a...
  20. Thread: PSU shelf life

    by ashiekh
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    8 hrs a day?

    8 hrs a day?
  21. Thread: PSU shelf life

    by ashiekh
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    Just for the sake of argument, not to be...

    Just for the sake of argument, not to be offensive, I doubt many high quality supplies can last 10 years (24/7) at full load. The warranty is a statistical gamble that few people will run 24/7, after...
  22. Thread: PSU shelf life

    by ashiekh
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    Normal 105C electrolytic capacitors might last...

    Normal 105C electrolytic capacitors might last 3000 hrs at 105C; now life doubles for about every 10C cooler, so lets run them at 45C, which is 6 doublings

    3000 x 2^6 hrs = 22 years

    So even...
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    It might be wired so that it can also get 5V back...

    It might be wired so that it can also get 5V back from the mother board, if so, I'd say it was a very messy new standard; even if it is a 12V only SATA cable, I'd still say it was a messy new...
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    I was confused because I saw a SATA connector on...

    I was confused because I saw a SATA connector on the power supply...

    https://youtu.be/iNCfnKEoRU0 (1.38)

    On my own 12V only power supply computer (HP Compaq 8000 Elite) the whole SATA cable...
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    I'm confused ...

    I'm confused

    https://www.intel.com/content/dam/www/public/us/en/documents/guides/single-rail-power-supply-platform-atx12vo-design-guide.pdf

    has 5V on the SATA connector (P34/35)
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