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Dalli

PSU making small buzzing

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Posted · Original PosterOP

Hi, as the title says my coolermaster mwe 550w 80+ bronze does make a veeeery low buzzing (?) sound when the pc is off, but I have to be really close to it and no surrounding noise.

Is this a commun psu thing or it happens sometimes and its ok or something is not right or I am in a grave danger (hope not 😛 ).

Looking for you answers thanks in advance.

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12 minutes ago, jonnyGURU said:

Normal.

 

Its normal the PSU makes noise when the PC is off? 

Not in my World.


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13 minutes ago, Praesi said:

Its normal the PSU makes noise when the PC is off? 

Not in my World.

In your world are you unplugging the PC after you turn it off?  Are you using an old school AT power supply or do you flip the switch on the back of your PSU off after you shut down the PC?

 

An ATX PC that is "off" is still on.  It's plugged in and getting power, the +5VSB is live, which means the USB ports and RAM are still receiving power.  Therefore, the PSU must maintain the bus power.

 

 

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20 minutes ago, Praesi said:

Its normal the PSU makes noise when the PC is off? 

Not in my World.

yep.......  what the heck is up with some PSUs someone else said they would smell like burned plastic and that would be fine!

 

 

that said maybe it's nothing to worry about I think @jonnyGURU knows a thing or two about PSUs...

Does it stop after a while though because that seems seriously weird.

 

ps: I have a PS3 that does the same, could that be also PSU? I always thought it's a condensator going bad..  


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1 minute ago, jonnyGURU said:

In your world are you unplugging the PC after you turn it off?  Are you using an old school AT power supply or do you flip the switch on the back of your PSU off after you shut down the PC?

 

An ATX PC that is "off" is still on.  It's plugged in and getting power, the +5VSB is live, which means the USB ports and RAM are still receiving power.  Therefore, the PSU must maintain the bus power.

 

 

None of my PSU´s as long i remember made any kind of noise when i turned the PC off.

Not the Gaming PC´s, not the Workstations. So if this is "normal", its actual new to me.


CPU i7 6700k MB  MSI Z170A Pro Carbon GPU Zotac GTX980Ti amp!extreme RAM 16GB DDR4 Corsair Vengeance 3k CASE Corsair 760T PSU Corsair RM750i MOUSE Logitech G9x KB Logitech G910 HS Sennheiser GSP 500 SC Asus Xonar 7.1 MONITOR Acer Predator xb270hu Storage 1x1TB + 2x500GB Samsung 7200U/m - 2x500GB SSD Samsung 850EVO

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3 minutes ago, jonnyGURU said:

In your world are you unplugging the PC after you turn it off?  Are you using an old school AT power supply or do you flip the switch on the back of your PSU off after you shut down the PC?

 

An ATX PC that is "off" is still on.  It's plugged in and getting power, the +5VSB is live, which means the USB ports and RAM are still receiving power.  Therefore, the PSU must maintain the bus power.

 

 

ah! no my USB is off when I turn the PC off, seriously just a slight buzzing would annoy me so much lol... (it's a bios settings to power the USBs apparently which I learned recently)


RYZEN 5 3600 | MSI GTX 1060 6GB GAMING X | 16GB CORSAIR VENGEANCE LPX 3200 DDR4 | MSI B350M MORTAR | 250GB SAMSUNG EVO 860 | 4TB TOSHIBA X 300 | 1TB TOSHIBA SSHD | 120GB KINGSTON SSD | WINDOWS 10 PRO | INWIN 301| BEQUIET PURE POWER 10 500W 80+ SILVER | ASUS 279H | LOGITECH Z906 | DELL KB216T | LOGITECH M185 | SONY DUALSHOCK 4

 

LENOVO IDEAPAD 510 | i5 7200U | 8GB DDR4 | NVIDIA GEFORCE 940MX | 1TB WD | WINDOWS 10 GO HOME 

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33 minutes ago, Praesi said:

None of my PSU´s as long i remember made any kind of noise when i turned the PC off.

Not the Gaming PC´s, not the Workstations. So if this is "normal", its actual new to me.

Since the +5VSB rail is live when the PC is off, electricity is still passing through the windings in the PSU like the PFC coil and the 5VSB transformer. When electricity passes through them, it will vibrate - sometimes at an audible frequency which can come and go depending on the load; e.g. in this case, having multiples of USB devices plugged in. One unit can be very loud and can be heard 5 feet away, where another unit of the same model can be heard only if you press your ears against the PSU with minimal background noise (like the OP). And of course, you may not hear anything at all because it out of the frequency range that humans can hear.

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1 hour ago, Mark Kaine said:

ah! no my USB is off when I turn the PC off, seriously just a slight buzzing would annoy me so much lol... (it's a bios settings to power the USBs apparently which I learned recently)

Right.. but you can't shut off +5VSB to your RAM.

 

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Posted · Original PosterOP

I mean if jonnyGURU himself said its normal then it is !

5 hours ago, Mark Kaine said:

ah! no my USB is off when I turn the PC off, seriously just a slight buzzing would annoy me so much lol... (it's a bios settings to power the USBs apparently which I learned recently)

yeah I have disabled powering my USBs from the bios (but they are still plugged-in idk if that matters) besides as jonny said it should be the RAM.

thanks again.

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