GPU Caps Out of Spec?

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  • itachi
    Member
    • Mar 2018
    • 27
    • Canada
    #1

    GPU Caps Out of Spec?

    My friend has this EVGA GTX770 GPU that, after 7 long years of use, is now starting to act up with artifacting and causing random black screens requiring a hard power down.

    I decide to check the caps, since I've revived other GPUs by replacing bad ones. Physically they all look fine. These are all very low ESR caps, like aluminmum polymer <=10 mhom and tantalum polymer in the range of 20-30 mohm. They all test fine ESR wise.

    They're grouped as follows:
    4x 270u 16V Al-polymer
    3x 100u 16V? tant-polymer
    9x 330u 2.5V tant-polymer
    4x 470u 2.5V tant-polymer

    The odd thing is, all 9 of the 330u range from about 208u to 247u. They clearly have "330" marked on them in large numbers, but they all seem to average to around 220u. The ESRs all test 20 or 30 mohm. Does anyone know if that's a sign of them failing, or are these actually 220u caps in disguise.
    Attached Files
    Last edited by itachi; 11-03-2021, 11:28 PM.
    Tags: None
    • PeteS in CA
      Badcaps Legend
      • Aug 2005
      • 3578
      • USA, Unsure of Planet
      #2
      Re: GPU Caps Out of Spec?

      Polymer caps don't have a liquid electrolyte that can evaporate over time. BTW, the dielectric in an electrolytic or polymer cap is not the electrolyte or the polymer. The dielectric is a layer of aluminum oxide on the surface of the anode foil. The electrolyte-soaked paper or polymer is a conformal conductor between the cathode foil and the aluminum oxide surface.

      Some ultra-low impedance electrolytics have had problems with the electrolyte attacking the aluminum oxide layer, but I've not heard of problems with the polymer affecting the aluminum oxide layer.
      PeteS in CA

      Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
      ****************************
      To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
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        Comment

        • stj
          Great Sage 齊天大聖
          • Dec 2009
          • 30950
          • Albion
          #3
          Re: GPU Caps Out of Spec?

          maybe they are breaking down slowly because of the ripple current.

            Comment

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