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How Much Watt PSU do I need?

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  #21  
Old 06-10-2009
Rage_3K_Moiz's Avatar
Sith Lord
 
Location: Sharjah, UAE
Member since: Sep 2005, 7,096 posts
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The electrolyte does deteriorate due to water evaporation; it is no myth. That is the main reason most good-quality mobo manufacturers use solid polymer caps.

And I agree, the CPX-850 looks like a very interesting new twist. Let's hope CPX pans out well and doesn't go as largely ignored as BTX.
  #22  
Old 06-10-2009
Quantex_rox's Avatar
TechSpot Enthusiast
 
Member since: Jul 2007, 152 posts
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But that takes a very long time even in bad capacitors. Solid caps still have a lifespan, and they are typically about the same amount of time as electrolytics. They are just able to reduce ripple even more effectively, and are super low ESR.

There are often caps that look like solid caps, but are actually electrolytics, they usually have thinner metal so they can barely stamp a vent in it so you can't see it.

What causes low quality caps to fail prematurely is the electrolyte breaks down and produces hydrogen gas, that causes the electrolyte to dry up in the capacitor, increasing the ESR to a failure level. When too much of the electrolyte has broken down, it will cause a lot of hydrogen gas to build up and eventually burst the capacitor (a.k.a to vent, the reason why there is the vent stamped on the capacitor)

Last edited by Quantex_rox; 06-10-2009 at 09:35 PM..
  #23  
Old 06-12-2009
TechSpot Member
 
Member since: Jun 2009, 50 posts
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Every 10 degrees hotter a capacitor is, its life time is cut in half. This is true for polymer and electrolytic capacitors. Polymers tend to have a longer lifespan at a higher temperature.
  #24  
Old 06-13-2009
TechSpot Evangelist
 
Location: Four Corners, US
Member since: Dec 2006, 10,622 posts
Wow, a new statistic. I'll bet my broadcast engineers would love to know that..
I do not find it documented anywhere.
  #25  
Old 06-14-2009
TechSpot Member
 
Member since: Jun 2009, 50 posts
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I know an article that complements that statistic wonderfully... let me try an find it.
  #26  
Old 06-14-2009
TechSpot Member
 
Member since: Jun 2009, 50 posts
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The rule "every 10 degrees hotter a capacitor is, its life time is cut in half." Electrolytic caps folow that rule exactly, for polymer graphs the relationship is less linear. For both caps every ten degrees its lifetime is severly reduced.

Heres an article:
http://www.gigabyte.com.tw/FileList/..._all_solid.htm
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