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Thread: Brand new 8yo Corsair HX 850

  1. #11
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    It's a DC-DC PSU.

  2. #12
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    Quote Originally Posted by Stefan Payne View Post
    With capacitors that were used (according to jon, they have a burn in test in the factory), that then were in store for almost a decade, its a problem.
    Because you need to "reform" the capacitors after a good amount in storage.
    Yes, but the caps should reform to ~95% of their actual "health" within the first couple of seconds, or straight up fail after 8 years.

    I'm sure you know, at least to some degree, that the aluminium+electrolyte salt that forms on the "pure" Al foil is the actual dielectric (insulator) between the Al "anode" and electrolyte "cathode". If the dielectric layer can't form fast enough to prevent massive electric arcs/shorts, the electrolyte will boil and you get anything from a slightly bulging to spectacularly exploding cap.

    The proper way to go about this would be to pass a steadily increasing voltage, starting from say 30% of the cap's rated max (not operating) voltage, which would help thicken the dielectric layer gradually, while staying below the breakdown voltage threshold for most of the cap's interior.

    Quote Originally Posted by none77 View Post
    It's a DC-DC PSU.
    Indeed, it is a double-forward (primary) DC-DC (secondary) PSU. As opposed to using LLC resonant half- or full bridge primary topology.

    Quote Originally Posted by Ziklitschli View Post
    Anyway, I'm in the process of building a rig atm, 400W tops (i3 8350k, RTX 2060) and would like to ask, is there any reason not to use this PSU? Or anything to be wary of if not? It's 6 - 8 years old, not sure exactly, my youth is a blur heh.

    I ask because I saw opinions online that it's bad to leave PSU unused, capacitor aging, current leakage, deterioration, weathering, corrosion, erosion, cracks, horror, pain and death.
    Actually on-topic, and taking into account everything previously discussed, I would personally be wary of using that PSU straight from the box, as it is now. If you don't have the proper equipment (a relatively precisely controlled lab PSU capable of outputting 2-12V) and knowledge (of where and how to hook it up), and you can't/won't give the PSU to someone who could gently bring it up to fully working condition; start the PSU up by shorting the PS_ON to a COM pin on the 24pin ATX connector, with as heavy a load attached to the PSU as you can manage. High power resistors (perhaps heating elements, or wirewound dissipators), DC light bulbs and/or motors with high current draw is what you're after. This is so the voltage will sag as much as possible before the PSU shuts down, so that the caps experience the least amount of voltage shock possible. After that (or alternatively if you can't find a suitable load bank), run the PSU with no load and not connected to the PC for at least a couple of minutes. If nothing bad seems to have happened after that, you may try using it on actual PC components.

    At least that's how I'd handle such an aging new-old stock PSU.
    Careful what you wish for... You just might get it.

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  4. #13
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    Hi guys,
    I have an old HX750 too, It's used so it doesn't have the problem of this one.
    I'm giving it for free to one my friend for his pc. Is it a decent psu? How much should he spent to have something better today?

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    Quote Originally Posted by Jon Gerow View Post
    Ok. CP part number isn't THAT old. The really old ones had part numbers that start with CMPSU.
    I'm still trying to determine its age, problem is, I have nothing. No receipt etc.

    Anyway, while still not exactly sure whether to use it or not (I lean heavily towards no), tommorow is decision day and I'm looking at my options, would be great if you guys helped me a bit more:

    https://proline.pl/zasilacz-fractal-...m-650w-p947674

    https://proline.pl/zasilacz-seasonic...-650w-p1106860

    https://proline.pl/zasilacz-silverst...d-550w-p926818

    https://proline.pl/zasilacz-silverst...-650w-p1078716

    https://proline.pl/zasilacz-thermalt...cgeu-1-p934176

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    Quote Originally Posted by Ziklitschli View Post
    I'm still trying to determine its age, problem is, I have nothing. No receipt etc.
    You can guess that with the Review I've linked.
    That's from 2012.
    So up to 7 Years is possible.
    Maybe a bit less.

    Quote Originally Posted by Ziklitschli View Post
    Anyway, while still not exactly sure whether to use it or not (I lean heavily towards no), tommorow is decision day and I'm looking at my options, would be great if you guys helped me a bit more:
    https://proline.pl/zasilacz-be-quiet...-550w-p1172036

    You could also be selling the PSU somewhere, if you wanted to.

    Or ask Corsair how old it could be...

  7. #16
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    Quote Originally Posted by Ziklitschli View Post
    I'm still trying to determine its age, problem is, I have nothing. No receipt etc.
    What's the first four digits of the serial number?

  8. #17
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    Quote Originally Posted by Stefan Payne View Post
    You can guess that with the Review I've linked.
    That's from 2012.
    So up to 7 Years is possible.
    Maybe a bit less.
    Yes, that's why I wrote 6 - 8 years initially.


    Quote Originally Posted by Stefan Payne
    https://proline.pl/zasilacz-be-quiet...-550w-p1172036

    You could also be selling the PSU somewhere, if you wanted to.

    Or ask Corsair how old it could be...
    I thought about writing Corsair but wait for my wife to go through the documents to check for receipt, no idea where she keeps those. Problem is she despises me and doesn't give a damn about my PC heh, went straight to sleep and I'm unable to wake her up, tried blackmail but didnt work.

    Yes I'll probably either give it away or sell it cheap to someone more willing to tinker with it.

    Thanks for the tip, that BQ is now my choice, wouldn't it be better though to go for Seasonic 650W to get closer to that 40% - 60% range and have some headroom for OC, cap aging, upgrades etc?

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    Quote Originally Posted by Jon Gerow View Post
    What's the first four digits of the serial number?
    1318

  10. #19
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    Quote Originally Posted by Ziklitschli View Post
    1318
    That's 18th week of 2013. It's six years old.

  11. #20
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    Quote Originally Posted by Jon Gerow View Post
    That's 18th week of 2013. It's six years old.
    Wow, thanks.

    Does that change things, significantly improve my chances or sth?

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