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AX1200i strange electrical buzzing sound


coccosoids
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I was just delivered an AX1200i and am currently testing to see if it's any better than my HX850i.

 

Right of the bat I noticed some random electrical buzz noise coming from it. It is short in duration, 2 to (maybe) 10 seconds long, and is random in occurrence, sometimes many times in succession, for a couple a minutes, many times an hour, and sometimes many hours apart and only once or twice per hour.

 

It sounds like a bad wiring in an old power outlet, where some shorting might happend.

 

Is this normal?!

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Depends on what the load is at the time of the buzzing and what components you have plugged into the PSU at the time.

 

Since I'm only testing and don't have a complete build yet I only have the motherboard, two cpu cables and one pcie cable (for the gpu) connected.

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Since I'm only testing and don't have a complete build yet I only have the motherboard, two cpu cables and one pcie cable (for the gpu) connected.

 

Ok. And no USB devices?

 

When does the buzzing occur? Is the PC in standby? Are you actually trying to boot the PC? In the BIOS? Installing the OS?

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Ok. And no USB devices?

 

When does the buzzing occur? Is the PC in standby? Are you actually trying to boot the PC? In the BIOS? Installing the OS?

 

Thanks for the fast reply.

 

The buzzing happens during normal operation. Working, browsing etc

There is one usb stick connected directly to the motherboard.

I had the HX850i in the exact same setup and there's no electrical buzzing whatsoever.

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Thanks for the fast reply.

 

The buzzing happens during normal operation. Working, browsing etc

There is one usb stick connected directly to the motherboard.

I had the HX850i in the exact same setup and there's no electrical buzzing whatsoever.

 

Ok. So you're not using a USB keyboard or mouse?

 

You're actually in Windows then.

 

I'm just trying to get at when the buzzing noises change.

 

See, at different loads the PSU's switching frequency changes. You have a PWM controller for your +12V and one for your +5VSB (which is what your RAM and USB uses). Different activity on either of those rails will cause the frequency to change and sometimes change to a range within an audible level.

 

For example: My daughter's PC is completely quiet. But when I plugged in a USB hub, it started making noise on the +5VSB. Unplugged the hub and the noise went away.

 

Assuming something is wrong with the PSU because another PSU didn't do the same thing doesn't mean anything as they are completely different PSUs .

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Ok. So you're not using a USB keyboard or mouse?

 

You're actually in Windows then.

 

I'm just trying to get at when the buzzing noises change.

 

See, at different loads the PSU's switching frequency changes. You have a PWM controller for your +12V and one for your +5VSB (which is what your RAM and USB uses). Different activity on either of those rails will cause the frequency to change and sometimes change to a range within an audible level.

 

For example: My daughter's PC is completely quiet. But when I plugged in a USB hub, it started making noise on the +5VSB. Unplugged the hub and the noise went away.

 

Assuming something is wrong with the PSU because another PSU didn't do the same thing doesn't mean anything as they are completely different PSUs .

 

Sorry, of course, yes: I have one usb keyboard and one usb mouse connected.

These didn't even register (like the usb too before you asked about usb connections) because who doesn't have a keyboard and mouse connected?

 

I understand that the pwm might change to a range withing an audible level, however assuming all or most PSUs would do that (which they don't since all my PSUs before haven't) why does it have to be to something that resembles so much a short circuit sound. The sound really does resemble like more power goes through the psu than it can handle and might blow something inside.

 

The sound is not audible at all times the usb stick was connected - so I do not believe it might have caused it, but I will definitely keep an eye on that to eliminate all possibilities.

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