Which is the better choice to replace 3300/6.3v caps?

[berniedd]

I'm going to replace a bunch of Elite caps 3300uf/6.3v in an ECS K7AMA2 mobo and the owner is in a rush. These caps are all located beside the power MOSFETs and their inductors. All I have right now are Samxons 3300uf/16v and 2700uf/6.3v. I'm inclined to use the 3300uf's but the voltage rating is quite afar from the 5v that normally runs through the circuit. On the other hand, the 2700's are of the correct voltage but are 20% lower in capacity compared to the originals. Which should I use? Thanks, guys.

[lucky13]

Re: Which is the better choice to replace 3300/6.3v caps?

If they are the same physical size as the original, use the 3300uF although you will be 'wasting" the higher voltage rating.

OTOH, if there are empty spots to add an extra cap, you could add extra 2700uF to make up the total capacitance of the 3300s. Make sure you use a meter to check the empty spot.

[MegaOne302]

Re: Which is the better choice to replace 3300/6.3v caps?

Go with the Samxons 3300uf/16v if they fit.

[berniedd]

Re: Which is the better choice to replace 3300/6.3v caps?

The 3300s fit, thanks guys.

[PCBONEZ]

Re: Which is the better choice to replace 3300/6.3v caps?

ESR is more important than uF in the VRM.
Use the one with the lowest ESR.

[MegaOne302]

Re: Which is the better choice to replace 3300/6.3v caps?

PCBONEZ is right.

[berniedd]

Re: Which is the better choice to replace 3300/6.3v caps?

I went with the 2700/6.3 (GF series) caps. Samxon website tells me these are low impedance types (0.042 ohm) but the 3300/16v (GS series) that I have are general purpose types whose impedance is not even listed. BTW, what does max ripple current refer to? The RC of the 2700/6.3 is 1650, while the RC of the 3300/16 is 1990.

[PCBONEZ]

Re: Which is the better choice to replace 3300/6.3v caps?

Passing Ripple Current causes heat inside the capacitor.
The Ripple Current rating is how much Ripple Current the cap can handle without over-heating.
You can think of it like a Watt rating on a resistor or the current rating on wire.
.

[hkivan]

Re: Which is the better choice to replace 3300/6.3v caps?

0.042Ω = 42 mΩ
Some Low ESR cap could have as low as a few mΩ only.
Nevertheless, you can still use the 2700 one without problem.

Besides, its always good to have your case with good ventilation .

[gdement]

Re: Which is the better choice to replace 3300/6.3v caps?

Samxon GF series are known for rampant failures in monitors. Just be aware they might not last.

[ratdude747]

Re: Which is the better choice to replace 3300/6.3v caps?

oops, what i orginally said was false so this post now reads:

[Newbie2]

Re: Which is the better choice to replace 3300/6.3v caps?

Samxon GF series are known for rampant failures in monitors. Just be aware they might not last.

Even if the Samxon GF series capacitors are known to be unreliable, they're still better than the Elite capacitors that he is replacing.

The Samxon GF capacitors will allow the motherboard to function if he does a successful recap, which can give him time to order high quality capacitors such as other series Samxon caps, Rubycon caps, Nichicon caps, etc.