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Thread: Do all power supplies have in cable capacitors?

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    Question Do all power supplies have in cable capacitors?

    Hello,

    I'm very new to this power supply business, but I'm just wondering if all power supplies need to have in cable capacitors in order to keep the ripple or whatever it's called at a good state. Do some have capacitors installed in the power supply itself or something?

    Thanks in advance.

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    Vast majority of the PSUs don't have additional caps on cables. All the filtering is done by caps inside the PSU. I'm not even sure if the caps on cables are anything more than a gimmick.
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    The majority don't.
    Capacitors near the connectors can help, but the benefit is minimal : you're basically forming a PI filter between the capacitors inside the power supply, the cable between the power supply and connector which behaves like a resistor and inductor combination and the capacitor near the connector.

    There are excellent power supplies which don't need capacitors by the connectors to be great. Have a look for example at the Seasonic Prime power supplies.

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    No need. No major effect.
    Last edited by Delter; 12-15-2016 at 10:14 AM.

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    Quote Originally Posted by yojo2 View Post
    I'm not even sure if the caps on cables are anything more than a gimmick.
    The caps are certainly not a gimmick. There's solid proof that putting capacitors as close to the load as possible reduces ripple.

    Now.. whether or not that reduction of ripple makes any difference in the grand scheme of things is another story. Unfortunately, review sights, like Tom's Hardware, that stack PSU's in a comparative table that show how one unit performs versus others, make good units look worse than they are because they're "not as good" as the competition. So now you have companies doing whatever it takes to make it to the top of these charts.

    Unfortunately, some users are just too lazy to read reviews. They use cues from stacked tables and bullet-pointed conclusions to make their decision without understanding the data or even reading the review in its entirety.

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    Quote Originally Posted by jonnyGURU View Post
    The caps are certainly not a gimmick. There's solid proof that putting capacitors as close to the load as possible reduces ripple.

    Now.. whether or not that reduction of ripple makes any difference in the grand scheme of things is another story. Unfortunately, review sights, like Tom's Hardware, that stack PSU's in a comparative table that show how one unit performs versus others, make good units look worse than they are because they're "not as good" as the competition. So now you have companies doing whatever it takes to make it to the top of these charts.

    Unfortunately, some users are just too lazy to read reviews. They use cues from stacked tables and bullet-pointed conclusions to make their decision without understanding the data or even reading the review in its entirety.
    Doesn't matter how you do it, when you deal with that kind of people there isn't a right way.

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