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    #1

    K8NNXP hissing

    My PC equiped with a Gigabyte K8NNXP motherboard and an AMD Athlon 64 3400+ CPU.
    It works fine and all, but when I start a game it starts making a hissing noise and it seems to be coming from the VRM. I don't have a DPS module installed so I'm running off a basic 3 phase VRM at the moment.

    Is this normal? or should I be concerned?

    Thanks.
    Don't find love, let love find you. That's why its called falling in love, because you don't force yourself to fall, you just fall. - Anonymous
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    #2
    Re: K8NNXP hissing

    I've also noticed that I can hear a hissing noise from my PC when I scroll up and down pages.
    Don't find love, let love find you. That's why its called falling in love, because you don't force yourself to fall, you just fall. - Anonymous

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      #3
      Re: K8NNXP hissing

      Our dell dimension does that sometimes, it sounds like someone scraping their nails across a chalkboard, but muffled.

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        #4
        Re: K8NNXP hissing

        It's normal.. I've got a similar gigabyte motherboard, and it does the same thing.. Some boards just have squeaky VRM's as equipped, don't have to have bad caps to make them noisy.. If you put some damping material on the toroids, it might fix it.. But the toroids might run hotter..

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          #5
          Re: K8NNXP hissing

          Originally posted by stevo1210
          a hissing noise and it seems to be coming from the VRM.
          Usually in PS, AC/DC converter - DC/DC converter, it is not normal to have a hissing sound, most of the time it is due to instability and some time it is a serious problem.
          In '91 I was working in a small company, we were producing a 45W PS with 5 outputs. There was a batch of them that after warming up, they starting to emit an hissing sound, any change in load level made them to blow up.
          At the end we discovered a bad ceramic cap mounted in the control loop (1uF 50V IIRC), it changed its value when the temperature increased over 40°C.

          The only family of PS I know that can emit hissing sound are self-oscillating converter, very often at low load or at no load they are noisy: I have a 7" Digital Picture Frame with an external PS, if I turn it off I hear the PS hissing.

          In your case I don't know what it can be, I think it is not normal but I don't know what you can do.
          Maybe when you are using game the CPU is at maximum load and the VRM has some instability problem.

          Ciao
          Gianni
          "In the confrontation between the stream and the rock, the stream always wins...Not through strength, but through persistence."
          H. J. Brown

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            #6
            Re: K8NNXP hissing

            Originally posted by 370forlife
            Our dell dimension does that sometimes, it sounds like someone scraping their nails across a chalkboard, but muffled.
            Same here, especially if I open one side of the case during those hot summer days. Scrolling pages usually makes the most noise. Games make only a bit of noise.
            I've noticed that quite a long time ago as well, and so far no problem yet. I'm guessing it's normal.

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              #7
              Re: K8NNXP hissing

              Originally posted by momaka
              Same here, especially if I open one side of the case during those hot summer days. Scrolling pages usually makes the most noise. Games make only a bit of noise.
              I've noticed that quite a long time ago as well, and so far no problem yet. I'm guessing it's normal.
              Hello.
              Annoying noises like those may be benign and even common to a specific model but they are not "normal".

              Where does it come from? Well, noise indicates air movement, which indicates that something is moving around. Probably not very far but really fast.

              Often it comes from a Toroid Inductor or coil where either the windings or iron core move around. The cause can be: a bad cap, poor circuit design or a defective Toroid. Other parts can move too, such as transistors or even circuit traces on the board, but coils are the most common as they depend on magnetic reaction against a fixed core to operate.

              You can usually isolate the exact component with an open stethoscope or even just a drinking straw. Just put one end to your ear and mover the other end around the board until you can hear where it's coming from.

              Actually solving it can be tricky. Often it's just a bad cap in the circuit, which is an easy fix. Sometimes the inductor coil itself is defective, other times it is a poor circuit design that can't easily be fixed.

              Some people advocate applying various compounds to the inductor to reduce movement or at least the transmission of noise. Examples are: coil and transformer varnish, potting epoxy, automotive RTV silicone.

              Personally, I feel that one should try to repair the cause rather than try to dampen something that wants to move around.

              Good Luck,
              Keri
              The More You Learn The Less You Know!

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                #8
                Re: K8NNXP hissing

                Well it sounds like a hard fix and there's nothing wrong with my PC so I suppose I'll leave it alone.

                Thanks.
                Don't find love, let love find you. That's why its called falling in love, because you don't force yourself to fall, you just fall. - Anonymous

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                  #9
                  Re: K8NNXP hissing

                  Ya our dell has been running for 5 years 24/7 with no problems.

                  Comment

                    #10
                    Re: K8NNXP hissing

                    I had one that made a rapid ticking noise (like spinning a ratchet wrench only not so loud) through the speakers sometimes when I scrolled with the mouse.
                    I just figured the +5v that goes to PS/2 and the sound chip had a crappy filter at the PS/2 port.
                    Never tried to fix it. System never broke.

                    It CAN be an indication of a serious problem but no other signs of other problems it's probably nothing to worry about.

                    .
                    Mann-Made Global Warming.
                    - We should be more concerned about the Intellectual Climate.
                    -
                    Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
                    - Dr Seuss
                    -
                    You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
                    -

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                      #11
                      Re: K8NNXP hissing

                      Originally posted by KeriJane
                      Often it's just a bad cap in the circuit, which is an easy fix.
                      I re-read your post and that part really stood out at me. I thought I had bad caps because I never actually checked the caps in my system before posting this thread. So I decided to check it and luckily, all the caps on my board are Rubycon MBZ & Nippon-Chemicon manufactured caps.... all in good condition as well.
                      Don't find love, let love find you. That's why its called falling in love, because you don't force yourself to fall, you just fall. - Anonymous

                      Comment

                        #12
                        Re: K8NNXP hissing

                        Originally posted by stevo1210
                        So I decided to check it and luckily, all the caps on my board are Rubycon MBZ & Nippon-Chemicon manufactured caps.... all in good condition as well.
                        Oh Ho!
                        That's generally a safe assumption..... that high-quality caps with no obvious damage are OK.....

                        But it's still an ASSUMPTION !

                        Beware of the obvious,
                        Keri
                        The More You Learn The Less You Know!

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