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PSU cables with inline capacitors: what happens if a cable cap goes KO?

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post #1 of 14 (permalink) Old 01-30-2019, 01:06 PM - Thread Starter
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PSU cables with inline capacitors: what happens if a cable cap goes KO?

question's in the title

both Corsair & Seasonic have nasty habit as of late of putting caps in their cables even if pro reviewers all think it's useless

and since those caps are not japanese ("100% jap cap" only applies to what's inside the PSU) my question is what happens if such a cap blows up? can it damage a component of the PC?

question #2: if a graphics card is powered via TWO cables (both with inline caps) what happens if only ONE of the cables has the cap go boom? does it create a dangerous "imbalance" of sorts?
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post #2 of 14 (permalink) Old 01-30-2019, 01:24 PM
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The Seasonic Prime Ultra series have those caps removed where the older Prime had them

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post #3 of 14 (permalink) Old 01-30-2019, 01:27 PM
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Is very unlikely that those capacitor will blow up since that don't receive a lot of heat and the "heavy" filtering is do it in the secondary side of the PSU. In my opinion aren't not useless, helps to reduce coil-whine in some cases and noise and ripple by a small margin. I think jonnyguru tested that. Usually have a small value. Because capacitors of high values only can filter in low frequency so by adding a small value capacitor in the PCI-E cable helps creating a wide range of filtering.
I manage to reduce the coil whine in system with low-end psu by adding a 100uF capacitor + 100 nF MKP right in the PCI-E connector

https://i.stack.imgur.com/zpsTQ.png

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post #4 of 14 (permalink) Old 01-30-2019, 01:36 PM - Thread Starter
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so 1- what happens if a cable cap goes KO is just removed?

and 2- if a graphics card is powered via TWO cables (both with inline caps) what happens if only ONE of the cables has the cap go boom is removed ? does it create a dangerous "imbalance" of sorts?
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post #5 of 14 (permalink) Old 01-30-2019, 01:41 PM
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Quote: Originally Posted by pulverizor View Post
so 1- what happens if a cable cap goes KO is just removed?

and 2- if a graphics card is powered via TWO cables (both with inline caps) what happens if only ONE of the cables has the cap go boom is removed ? does it create a dangerous "imbalance" of sorts?
If you remove the caps just increase a little bit the noise and ripple. Usually when you design the filtering side of the PSU you don't use a capacitor of a single value and type of capacitor, you use various values and type of capacitors to create a wide effective filtering

Here you have a good explanation :

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post #6 of 14 (permalink) Old 01-30-2019, 01:44 PM - Thread Starter
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ok

what about scenario 2 (where only ONE of the 2 cables feeding the GPU, has its capacitor removed) is that potentially dangerous if only one of the 2 cables has a current that's "less clean" than the other cable? can this "imbalance" damage the card?
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post #7 of 14 (permalink) Old 01-30-2019, 01:49 PM
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Quote: Originally Posted by pulverizor View Post
ok

what about scenario 2 (where only ONE of the 2 cables feeding the GPU, has its capacitor removed) is that potentially dangerous if only one of the 2 cables has a current that's "less clean" than the other cable? can this "imbalance" damage the card?
Not even remotely. As a said before those capacitor are like "final" filtering don't do the "heavy work". Can be problematic if some of the capacitor inside of the PSU blow up that happens on low-end psu and kill components. I seen it happen dozen of times in my work

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post #8 of 14 (permalink) Old 01-30-2019, 02:01 PM - Thread Starter
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Quote: Originally Posted by lexer View Post
Not even remotely. As a said before those capacitor are like "final" filtering don't do the "heavy work". Can be problematic if some of the capacitor inside of the PSU blow up that happens on low-end psu and kill components. I seen it happen dozen of times in my work
so even if the 2 cables feeding the graphics card are "different" (one with missing cap & more ripple then the other) it's no biggie?
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post #9 of 14 (permalink) Old 01-30-2019, 02:18 PM
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Quote: Originally Posted by lexer View Post
Is very unlikely that those capacitor will blow up since that don't receive a lot of heat and the "heavy" filtering is do it in the secondary side of the PSU. In my opinion aren't not useless, helps to reduce coil-whine in some cases and noise and ripple by a small margin. I think jonnyguru tested that. Usually have a small value. Because capacitors of high values only can filter in low frequency so by adding a small value capacitor in the PCI-E cable helps creating a wide range of filtering.
I manage to reduce the coil whine in system with low-end psu by adding a 100uF capacitor + 100 nF MKP right in the PCI-E connector

https://i.stack.imgur.com/zpsTQ.png

I have an EVGA Supernova G2 1000w and a 2080Ti which produces a significant amount of coil whine under load. Is it possible to get an adapter with capacitors that would sit between the normal VGA cables and the PSU itself? (male->capacitor->female)

Also what is the point of adding two different capacitors? one regular and one MKP (which I am assuming is an metallized polypropylene film capacitors)

I would also wonder if there are issues with a heavy (400w+) gpu load as that places like 150w+ on each 8pin and by association each individual set of capacitors.

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post #10 of 14 (permalink) Old 01-30-2019, 03:11 PM
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Quote: Originally Posted by pulverizor View Post
so even if the 2 cables feeding the graphics card are "different" (one with missing cap & more ripple then the other) it's no biggie?
I doesn't matter because the connectors are in parallel, most PSU today have only a single rail. Even in multi-rail PSU the output are "artificially" divided with shunt resistors that monitor the output of each rail but in reality is one


Quote: Originally Posted by anticommon View Post
I have an EVGA Supernova G2 1000w and a 2080Ti which produces a significant amount of coil whine under load. Is it possible to get an adapter with capacitors that would sit between the normal VGA cables and the PSU itself? (male->capacitor->female)

Also what is the point of adding two different capacitors? one regular and one MKP (which I am assuming is an metallized polypropylene film capacitors)

I would also wonder if there are issues with a heavy (400w+) gpu load as that places like 150w+ on each 8pin and by association each individual set of capacitors.
MKP capacitor has lower impedance at higher frequencies than a electrolytic capacitor, so basically you create a more effective filtering than using only a one capacitor. Your PSU have a super b ripple suppression like 10-15mV at full load. I'm not sure that will help but you can give it a try, place a capacitor right in the PCI-E connector and see if helps. You can try different values. BE SPECIALLY CAREFUL WITH THE POLARITY because if you put the capacitor backward it will blowup, MKT capacitors don't have polarity

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