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Thread: Corsair CX 750M coil whine

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    Default Corsair CX 750M coil whine

    Hi all,

    I have an Corsair CX 750M PSU which is making coil whine when my system is idling.
    This is my 3rd Corsair PSU that does it so I'm thinking about switching to another brand.
    Before I go through with the switch, I would like to exclude that the problem is somewhere else then the PSU and when it's the 3rd PSU to do this, it get's me thinking.

    I've done some troubleshooting to exclude power cables, wall outlets and extenders.
    Tested 2 different outlets both with 2 different power cables directly connected and with 2 different extenders.
    I even changed my motherboard as I thought that could be the reason, but the coil whine is still there.

    Is there anything else I can try before I switch the PSU again?
    If I switch the PSU again, I wont select a Corsair because of this experience with the coil whine.

    I'm looking at the OCZ Fatality 750M which has received high scores in the reviews I've read but am open to suggestions.
    My price limit is between the price of the Corsair CX 750M and the OCZ Fatality 750M and I would like to stick to a modular PSU.

    Thanks in advance.

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    Default Re: Corsair CX 750M coil whine

    Are you really sure it is your PSU? There is also coil whine within GPUs. That might explain why it is still there after 3 PSU replacements. I had a 660ti that had coil whine. There isnt much you can do about it. I did get mine to quiet down by playing with clock speed and core voltage.
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    Default Re: Corsair CX 750M coil whine

    Quote Originally Posted by Cyberburnout View Post
    Are you really sure it is your PSU? There is also coil whine within GPUs. That might explain why it is still there after 3 PSU replacements. I had a 660ti that had coil whine. There isnt much you can do about it. I did get mine to quiet down by playing with clock speed and core voltage.
    Before I switched it last time, I split up all the hardware and the noise was clearly coming from the PSU.
    If I make the PC work a little (Prime95 or any other program that isn't related to the GFX card), the whine goes away - including moving the mouse around.
    I'm 99% sure that the whine comes from the PSU but before I switch it out, I want to be 100%.
    I guess the only way to be 100% sure it's not the GFX card is to test with another card and see if it still makes the coil whine.

    Yesterday I overclocked my CPU and disabled all the power saving options and that helped a little though the whine is still there (just not very loud).

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    Default Re: Corsair CX 750M coil whine

    Quote Originally Posted by ScottyG View Post
    Before I switched it last time, I split up all the hardware and the noise was clearly coming from the PSU.
    If I make the PC work a little (Prime95 or any other program that isn't related to the GFX card), the whine goes away - including moving the mouse around.
    I'm 99% sure that the whine comes from the PSU but before I switch it out, I want to be 100%.
    I guess the only way to be 100% sure it's not the GFX card is to test with another card and see if it still makes the coil whine.

    Yesterday I overclocked my CPU and disabled all the power saving options and that helped a little though the whine is still there (just not very loud).

    OK. Just wanted to make sure you were replacement the right part.

    Next would be a grounding issue. Btw can you hear this noise from your speakers? You said something about moving your mouse around? When you can hear the noise or it changes when you move your mouse around it is not coil whine. That is a Ground Loop.
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    Default Re: Corsair CX 750M coil whine

    Quote Originally Posted by Cyberburnout View Post
    OK. Just wanted to make sure you were replacement the right part.

    Next would be a grounding issue. Btw can you hear this noise from your speakers? You said something about moving your mouse around? When you can hear the noise or it changes when you move your mouse around it is not coil whine. That is a Ground Loop.
    No there isn't any noise from the speakers or through my headset.
    If I put my ear down to the back of my PC, it's clear that it's coming from the PSU.

    If it's a Ground Loop, how can I make it stop?
    It's an old building complex I live in and I have no outlets with ground connectors.

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    Default Re: Corsair CX 750M coil whine

    Quote Originally Posted by ScottyG View Post
    No there isn't any noise from the speakers or through my headset.
    If I put my ear down to the back of my PC, it's clear that it's coming from the PSU.

    If it's a Ground Loop, how can I make it stop?
    It's an old building complex I live in and I have no outlets with ground connectors.


    Since you have no ground it isnt a Ground Loop however I am guessing that is why there is coil hum. Replacing the PSu may or may not help. Maybe the next one you select will have done a better job of dampening on the coils. Maybe it will work fine for a few months then start up again.

    IS there anything in the same outlet or even in the same room that is plugged up? You can try unplugging them one at a time to see if it goes away. I can explain why this can help but it isnt important.

    And the final solution which may void your warranty. Open the PSu and dampen the coils yourself. Using glue or a silicon without acetic acid. We used silicon. Not the tile and bath stuff. The clear or white kind. Do not cover the entire coil. Just a glob at the base of the coils. left cure completely before powering back on.
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    Default Re: Corsair CX 750M coil whine

    Quote Originally Posted by Cyberburnout View Post
    Since you have no ground it isnt a Ground Loop however I am guessing that is why there is coil hum. Replacing the PSu may or may not help. Maybe the next one you select will have done a better job of dampening on the coils. Maybe it will work fine for a few months then start up again.

    IS there anything in the same outlet or even in the same room that is plugged up? You can try unplugging them one at a time to see if it goes away. I can explain why this can help but it isnt important.

    And the final solution which may void your warranty. Open the PSu and dampen the coils yourself. Using glue or a silicon without acetic acid. We used silicon. Not the tile and bath stuff. The clear or white kind. Do not cover the entire coil. Just a glob at the base of the coils. left cure completely before powering back on.
    The PSU is 3 months old and I don't want to loose warranty so opening it up isn't an option for me.
    Am getting tired of replacing the unit but the whine is annoying me more so I guess it will be a switch for me.
    Can you recommend any PSUs within the price range I explained in the first post?

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    Default Re: Corsair CX 750M coil whine

    The SuperNOVA is in my price range. The NZXT is only 10 eur more expensive but am a poor man so I have to save where I can. Will most likely try the SuperNOVA.
    Thank you very much for your help and suggestions.

    EDIT: Can see that the FSP Group is available in 650W. You think that would be enough for my system? I would like to put another graphics card in it some day but that's the only upgrade planned.

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    Default Re: Corsair CX 750M coil whine

    Quote Originally Posted by ScottyG View Post
    The SuperNOVA is in my price range. The NZXT is only 10 eur more expensive but am a poor man so I have to save where I can. Will most likely try the SuperNOVA.
    Thank you very much for your help and suggestions.

    EDIT: Can see that the FSP Group is available in 650W. You think that would be enough for my system? I would like to put another graphics card in it some day but that's the only upgrade planned.


    if your system specs are up to date then yes 650w would be fine. However you should leave yourself room for future upgrades. 2nd GPu? water cooling ect. I always buy the most power i can at the moment.
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    Default Re: Corsair CX 750M coil whine

    Quote Originally Posted by Cyberburnout View Post
    if your system specs are up to date then yes 650w would be fine. However you should leave yourself room for future upgrades. 2nd GPu? water cooling ect. I always buy the most power i can at the moment.
    I understand. It's better to be sure that there is enough.
    The hardware I have now is what I will stick with for a long time. Only upgrade I've thought about is a 2nd GPU and if a 650W gold would be enough for that, I'm thinking that it would be a wise decision to choose that.

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    Default Re: Corsair CX 750M coil whine

    Buy a SeaSonic brand. If you can't afford one, save a little. They are as good as it gets IMHO.

    A building without grounding is your problem.
    Corsair makes good PSU's, but no ground ~at all~ leaves no place for that whine/signal to go.

    If you had a good ground, it wouldn't be happening. Buying something new (PSU) may not help at all.

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    Default Re: Corsair CX 750M coil whine

    +1 Seasonic.

    Always look beyond the limits...

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    Default Re: Corsair CX 750M coil whine

    Quote Originally Posted by realneil View Post
    Buy a SeaSonic brand. If you can't afford one, save a little. They are as good as it gets IMHO.

    A building without grounding is your problem.
    Corsair makes good PSU's, but no ground ~at all~ leaves no place for that whine/signal to go.

    If you had a good ground, it wouldn't be happening. Buying something new (PSU) may not help at all.
    Yea I've heard great things about Seasonic but they are just so darn expensive. It would take me many months to save up to one of those so currently I will have to pass for now.

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