unidentified coil whine and fan spin up..

[jinxpad]

Hey everyone,

Hoping that maybe I can find a solution as to what's going on. Just finished transferring my PC into new case, tidied up some of the cable management, Finally finished setting up all the fan curves, And then once that was done I heard it for the first time.

Suddenly it sounds like some of the fans are spinning up and increasing in speed and there's also some coil whine.
I don't know how well you can hear it in this video but this is taken during the coil wine and when the fans are going faster than usual and you will hear at the end the fans spinning down in the coil wine disappearing -

Fan spin + coil whine.. but from where... and why?

www.youtube.com

The kicker is, I don't know which ones because the sensors show no change in rpm when this happens. It's not the GPU, When the fans spin up on the gpu it has a completely different tone and also the sensors show it running a consistent speed as well.

This will also happen sometimes when I'm not doing anything at all I can literally sit here staring at the same page and it will just spin up for about 30 seconds or a minute and then stop on its own. It can happen during gaming or when I'm watching a video.

I don't think it's anything related to windows because it's also happened when I'm tinkering in the BIOS, adjusting smartfan settings. So I'm really at a loss as to which fans are speeding up and where the coil wine is coming from and what's causing it.

Any ideas?

 

[jinxpad]

If its not showing on your rpm monitoring, then which gave aren't monitored? PSU? Chipset? Other random ones?

At a guess, I'd assume it's psu, heating up over time at idle, kicks in fan to cool down, then spins down to low rpm or passive mode. Maybe it has a switch on it to disable passive/eco mode so it'll just run low rpm all the time and that could help. Or not.

Coil whine being at the same time... I've no idea. I'm only used to hearing whine when components are stressed under heavy load, and generally only at extreme fps.

It was exactly that, the PSU, I realised the following day that I had enabled eco mode. It's all good now, although the mild coil whine might be something thats always been there but I never heard due to case fans etc.