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Thread: This post on LTT made me lose my shit....

  1. #21
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    Quote Originally Posted by Nuckles_56 View Post
    My best guess it is as a result of this article
    No, that's too new.
    That myth is around way longer than that article...

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    That was my best guess and is the only time that I have seen anything like it

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    Quote Originally Posted by Stefan Payne View Post
    where does that shit come from?
    I couldn't find any evidence of it.

    The only thing I could find was the Lifetime spec in capacitor datasheets...
    "Capacitor aging" is the term that got thrown around the 'net, and was at some point incorporated into the very first PSU calculators. Someone incorrectly stipulated that old and worn out caps will result in the actual direct lowering of max supplied power, and the brilliant idea caught on.

    I mean I can accept that ESR will drift over time due to electrolyte degradation and evaporation, and I can also accept that this would result in less ripple suppression and perhaps even a bit looser v-reg. But if the PSU and its components are at all worth their salt, the effect shouldn't be overly pronounced, perhaps even negligible in some cases.

    However, instead of concluding that it's not max delivered power that goes down but rather the quality of it, some genius took things a bit to literally.

    Then someone else somewhere exclaimed that if caps degrade over time, all the other components must do too, which led to the simple and very wrong "PSUs deteriorate over time, thus their power output lowers" myth.

    It's right up there with the "multi-rail traps power through unnecessary limitations" and "80+ rating is a direct indicator of quality and performance" mental delights...
    Careful what you wish for... You just might get it.

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    Quote Originally Posted by McSteel View Post
    "Capacitor aging" is the term that got thrown around the 'net, and was at some point incorporated into the very first PSU calculators. Someone incorrectly stipulated that old and worn out caps will result in the actual direct lowering of max supplied power, and the brilliant idea caught on.
    Now that you mention it, I think I remember something I don't want to...

    Quote Originally Posted by McSteel View Post
    It's right up there with the "multi-rail traps power through unnecessary limitations" and "80+ rating is a direct indicator of quality and performance" mental delights...
    ...and that peak efficiency of a PSU is at 50% load...
    ...and that PSU must not be used to 100% (well, in ancient days that indeed was the case)...

    And other fairy tales about Power Supplys...
    It's just a black box that generates power, has NO effect on FPS, so utterly unimportant...

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    If this was 1984 and I was developing Newspeak, I would remove the words "power" and "max" from the new language.

    Mcsteel, where you been, in the woods hiding?

    Plus, speaking of these "myths", older articles from Hardwaresecrets also kind of have them.

    Finally, you will need to know how much power your PC will really consume before picking a power supply. There are several calculators on the Internet that can help you out with this; we recommend this one. We also recommend that you choose a power supply that will be working between 40% and 60% of its maximum capacity. There are two reasons for this. The first is efficiency, a subject that we will explain next. Second, you will have headroom for future upgrades. Get the result obtained from the calculator and multiply it by 2. This is the power supply wattage we recommend that you buy. (You will be surprised that most systems will require a power supply with less than 450 W, even with our adjustment.)
    http://www.hardwaresecrets.com/every...er-supplies/8/

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    To be fair, that article is from 2008 and old PSU tech worked on a fixed switching frequency. Efficiency that peaked at 50%, and often well beyond 80 PLUS requirements for that load, would often "barely hit" 80 PLUS targets at 20% and 100%. So it's not really a false statement.

    Not until LLC's variable frequencies have we seen the flat line efficiency that we fairly commonly seen today.

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    Quote Originally Posted by jonnyGURU View Post
    Efficiency that peaked at 50%, and often well
    Well, according to the ancient Planet3dnow reviews, no.
    Peak Efficiency was mostly at higher points like 80%.

    Here the old Link for the 2006/2007 roundups:


    http://www.planet3dnow.de/artikel/ha...unter_50_euro/
    http://www.planet3dnow.de/artikel/ha.../mittelklasse/
    http://www.planet3dnow.de/artikel/ha...2006/highend//

    The Problem is that we don't have much data for that timeframe...

    Quote Originally Posted by turkey3_scratch View Post
    Plus, speaking of these "myths", older articles from Hardwaresecrets also kind of have them.
    Well, yeah, but in 2008 what now is the lower end was high(est) end then.
    And also there were some problems with full load at the time. Tomshardware did some 24h endurance test with PSU and many failed - that was in 2005 or so.
    http://www.tomshardware.co.uk/stress...view-1362.html

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    Yeah but low end units today may be the same way which is why these myths still exist, because they sort of do apply to low end units.

  11. #29
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    And even then they are not terribly relevant anyway.

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