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Thread: ripple suppression vs voltage regulation: which is more important?

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    Question ripple suppression vs voltage regulation: which is more important?

    question's in the title
    first such question on the web (I googled) that's why I make this topic

    suppose you compare 2 PSUs both have good voltage regulation & ripple suppression, however one's much better with the voltage & the other's much better with ripple


    aux questions: when it comes to ripple which of the PC's components - the ones using 3.3V, 5v or 12v - are more sensitive to ripple? (in other words for which of these rails is ripple control the most important?)
    same question about voltage - on which rails is bad voltage control the most dangerous for the components?

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    There is so much more then only voltage regulation and ripple.

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    yeah I know there's holdup time transient response & all that not to mention build quality

    anyway which is more important between ripple control & voltage control?

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    Whichever one violates ATX specs. If neither does, you won't have a problem in those regards (but could have one if some other spec is violated or PSU is faulty).

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    AFAIK ripple is a detriment to caps, wherever they are.
    Said that, IIRC under 100mV (somehow typical high ripple in laptops), good caps are mostly safe (and so the parts which they belong).
    Best, Luca

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    Quote Originally Posted by quest for silence View Post
    AFAIK ripple is a detriment to caps, wherever they are.
    Said that, IIRC under 100mV (somehow typical high ripple in laptops), good caps are mostly safe (and so the parts which they belong).
    shit...a 2nd-hand mainboard I recently bought was connected to a low-end PSU with ~90mv ripple - "mediocre" by reviewer standards - and was used as such for about 5 years inc. intensive stuff like gaming. the caps on that mainboard are solid type but only of APAQ brand so dunno how well they took that ripple all these years & in what state they are now :/

    (gonna replace the PSU of course to limit the damage of course)

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    so anyway ripple control is the most important for the PC's safety then?
    (reviews say Corsair units are better when it comes to ripple control apparently)

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    Quote Originally Posted by quest for silence View Post
    AFAIK ripple is a detriment to caps, wherever they are.
    Said that, IIRC under 100mV (somehow typical high ripple in laptops), good caps are mostly safe (and so the parts which they belong).
    Typical, well, no wonder with the number of cheap chinese craps in use. On the other hand you cannot be surprised with the prices of original laptop PSUs. Manufacturers are milking the users like a typical industrial cow.

    It's actually the reason why mobile CPUs run at 0.2 V or even higher voltage than they could, so they are stable even when switching the clock the whole time. Hey I think next time I will be messing with some laptop, I'll have a look at cap upgrade just for the fun, may as well compare if I can reach lower stable voltages afterwards…

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    I've been wondering the same thing myself. For example, what if you're on a limited budget, and your options are as follows. (Assume everything else is pretty much the same among the units, and decent enough quality / reliability.)

    1. 12V regulation from 11.401 - 12.599 V, ripple maxing out at 0.01 mV (or whatever is the best @OklahomaWolf has ever seen).
    2. 12V regulation spot on, ripple flirting with 119.999 mV peak.
    3. 12V regulation 11.7 - 12.3 V, ripple touching 60 mV.

    Basically, one aspect being right on the edge of spec with the other being perfect, or, both being in the middle.

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    Quote Originally Posted by cossack View Post
    so anyway ripple control is the most important for the PC's safety then?
    AFAIK unless voltages go out of spec (as for instance on cross loads with cheap group regulated units), which may lead to VRM/IC suffering (may = depends of VRM/IC).


    Quote Originally Posted by pianoplayer88key View Post
    3. 12V regulation 11.7 - 12.3 V, ripple touching 60 mV.
    This (IMHO).
    Last edited by quest for silence; 02-08-2017 at 07:26 AM. Reason: grammar correction
    Best, Luca

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