computer makes high pitched noise when turned on

'Coil whine' has become a generic term for audible electrical noises. This noise in coils is often addressed by using better quality coils with tighter windings, and coating the windings with a varnish.

But the frequency of this AC current can change with load and at some frequencies, a mechanical resonance may occur that produces a high frequency noise. In a power supply circuit, coils are used to eliminate left over AC noise from the DC output. All a coil is comprised of is a core with a copper wire wound around it. This is because a lot of times this noise is coming from coils. Often, people do call these electrical, non-fan related noises 'coil whine'. So you can have a PC sitting in a room, with a power supply that's making a high pitched squealing noise, and if two people are sitting in the same room one of them may be able to hear the noise while the other one hears nothing at all. Many people, especially those over 25 years of age, cannot hear noises over 15kHz, while others can hear noises all of the way up to 20kHz. The other reason is that often these noises can be at such a high frequency that only some people are actually able to hear them. I'll get into more detail about that in a little bit, but what this does mean is that a PSU that makes a noise in one PC during one game or benchmark program may not make the same noise in another. One reason is that the noise can change, or be completely absent, depending on the load on the power supply. These noises can come and go and can be difficult to troubleshot for a couple of reasons. These noises can sound like hissing, buzzing or a high pitched whine.

Some power supplies exhibit noises that come from components other than the intake fan. What is that noise coming from my power supply? But we haven't forgotten that there are power supply noises that come from other than from the fan, and in this article I will detail some of the additional steps we have taken to limit PSU noise in our new RM Series power supplies.

We've developed quieter fans with quieter fan motors and fan blades designed specifically for moving air through the crowded PCB of a power supply.

Our power supply fans remain silent until 20%, 40% and even 60% load. Over the past few years, Corsair has refined its ZeroRPM fan technology.

Computer makes high pitched noise when turned on