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  • In previously common 80mm fans PSU capacitor location was quite good, as it is near air intake. Lot of air passes by.


    As we move to present day


    Air coming from top, but lot of time capacitor is in the corner, give it 85 degrees rated capacitor and some time and it'll be issue. Photo above is for good PSU (no longer made) that fail with around 90% probability within 3-5 years time.

    Sample of one of Seasonic PSU designs


    Better cooling, 105 degrees Japan capacitors and hence very long warranty (they have 7-11 year for good products).

    800 x 576 - 96K
    539 x 562 - 89K
    546 x 387 - 62K
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  • Bad designers made heatsinks (now in lot of PSUs)



  • PSU orientation in low position:


    Can save your PSU capacitors life or lower temperature inside and save other capacitors and stuff.

  • PSU capacitors, philisters and science aka legend of Japanese caps

    If you look around, people made lots of tier lists, for example for PSU capacitors -,4193-5.html .

    Yet it is completely philister, anti scientific point of view.

    First - it is idiotic and static brand generalization. Each of brands have lot of capacitor lines made for different purposes and with different construction and prices. And it all changes constantly. Plus each brand has periodic problems with some specific capacitors, usually not big, but shit happens.

    Second - properly selected and cooled 105 degrees Chinese/Taiwanese capacitor can live 10-20 times more compared to improperly placed 85 degrees Japanese one.

    Third - capacitors life also depend on quality of PSU design, air flow, ripple, etc.

    Fourth - top PSUs usually are designed for long work under load close to 90-100% of their specifications.
    Yet, heat generated inside cheap Bronze class PSU will be around 30W for 300W real load with 550-600W PSU, and such PSU usually have much more space.

    For top expensive Titanium class PSU that many get to work at 570W (multiple top GPUs and such), heat will be around 47 watts with more crowded construction and more silent fan. Such PSUs really need top capacitors for long life.

    Simple example, OCZ (now out of business) made ModXStream PSUs that liked to fail right after warranty

    Initially they used more reputable (among Taiwanese :-)) Teapo LH 85C capacitors. Yet they failed and fast. Most probably reason - very low fan speed and bad location with two hot yet flat heatsinks.


    After this they switched to Transcend Electrolytic (Trec), not small company, but not regarded at all. Yet it behave much better.
    All PSUs I saw with them worked for >6 years without hitch.


    Note that press also have small gains from cartel agreement that exist among Japanese manufacturers for long long time -