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I have a computer from 2001 whose power supply probably needs to be replaced soon (the fan sometimes makes noises). It is currently using a 10-year old FSP400-60PFN 400 watt PSU. Power supplies from that era output the vast majority of their power on the 3.3V and 5V rails. As you can see from the FSP400-60PFN specs, it could output 235W combined on the 3.3V and 5V rails.

It seems modern power supplies output the vast majority of their power on the 12V rail. One modern 430W PSU only outputs 120W combined on the 3.3V and 5V rails. Even a 1600W PSU still only outputs 120W combined on the 3.3V and 5V rails.

I could try to get a used 2001-era power supply, but I'm not sure how reliable it would be since it may suffer from the "capacitor plague" problem of that era.

Are there any modern power supplies that output the vast majority of their power on the 3.3V and 5V rails? It'd be nice if it had Molex connectors too.

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    Half wondering if reworking the caps and replacing the fan on an older PSU might be an option, Somewhat out of the scope of the site, but replacing electrolytics and fans isn't rocket science.
    – Journeyman Geek
    Apr 30, 2016 at 23:54
  • I agree with Journeyman Geek. Several of our production machines are old (DOS, WIn 3.11 and etc). It can be difficult finding replacement parts. So, I look at the electrolytics (capacitors) to see if they are expanded/bulging on the top. If they are, then they are failing/failed. Simply finding compatible replacements has fixed the issue.
    – Linger
    May 6, 2016 at 13:15
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    Why can't you replace the computer with something low-end, but modern? Money?
    – cybernard
    Jul 12, 2016 at 3:05
  • amazon.com/ATX-Motherboard-Power-Converter-Cable/dp/B000E7JUVO This is half your answer.
    – cybernard
    Jul 12, 2016 at 3:36
  • Look at this one: evertek.com/viewpart.asp?auto=8380 Combined with my last entry.
    – cybernard
    Jul 12, 2016 at 3:58

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