Coil Whine in Your Computer: What the Noise Is and Whether It's Dangerous

You launch a game, open a menu running at hundreds of frames per second, or simply scroll a web page — and from the case comes a thin whine, buzz or chirping, a bit like an old TV set. The sound changes with the workload and vanishes when the computer is idle. The fans have nothing to do with it: this is the sound of electronic components. It's known as coil whine.

What inductors are and why they whine

An inductor, or choke, is a coil of copper wire wound around a core. There are many of them on a graphics card, on the motherboard around the processor and inside the power supply. They take part in voltage conversion: current flows through them and changes extremely quickly, hundreds of thousands of times a second. The alternating magnetic field makes the windings and the core vibrate slightly. Normally this vibration happens at frequencies people can't hear. But in certain operating modes — especially when the load rises and falls in step with the frames on screen — the vibration falls into the audible range and the coil starts to "sing".

Hence the tell-tale feature: the whine depends on what's happening on screen. In a game menu where the graphics card renders several hundred frames a second, it can be particularly loud, then fade in a demanding scene running at 60 frames.

Where the whine usually comes from

• the graphics card — the most common source, especially powerful models under heavy load;
• the power supply — whining at idle or at a particular load, sometimes even when the PC is off;
• the motherboard — the CPU power circuitry, especially as power-saving states change;
• laptops — a quiet whine when running on the charger or in power-saving modes;
• monitors and external power adapters — a thin sound at certain brightness levels.

Is coil whine dangerous?

In most cases coil whine is a characteristic of a particular unit rather than a fault. Two identical graphics cards from the same batch can sound completely different. Manufacturers consider the noise acceptable, and on its own it doesn't shorten component life. There are, however, situations where the whine should be treated as a warning sign:

• the sound appeared suddenly on a device that used to be quiet;
• the whine comes with clicking, crackling, a smell or heat;
• the computer has also started restarting or shutting down under load;
• the whine is coming from the power supply and getting louder over time;
• you can hear it even with the computer switched off but still plugged in.

In these cases the noise may indicate ageing capacitors, an overloaded power supply or poor mains voltage quality.

What affects how loud it is

Frame rate. The more frames per second the graphics card produces, the more often the load changes and the more likely the whine. Capping FPS at the monitor's refresh rate often reduces it noticeably.

The power supply. The PSU's quality and characteristics influence how the graphics card's power circuitry behaves. Sometimes replacing the power supply with a better one reduces graphics card whine.

The case. Open and mesh cases let the sound through; closed cases with sound damping muffle it.

Unit-to-unit variation. Manufacturing tolerances in the coils are the main reason one card whines and the next one doesn't.

What can be done

Coil whine can't always be eliminated entirely, but it can usually be brought down to an unnoticeable level. A technician assesses the situation and suggests options:

1. Identify the source — graphics card, power supply or motherboard — using load tests and careful listening.
2. Test the power supply for stability and, if needed, replace it with a quality unit with headroom.
3. Set a frame-rate cap and monitor sync in the graphics driver, removing the loudest operating modes.
4. Optimise power consumption — a mild graphics card undervolt, for example, reduces stress on the power circuitry.
5. Check the mains supply and connect through a good surge protector or UPS.
6. Consider a warranty replacement if the device is new and the whine is very loud.

Warranties and coil whine

Many retailers won't accept graphics cards back under warranty for coil whine, considering it normal. But if the noise is very loud, interferes with work or comes with instability, you have grounds to make a claim. A technician can write up the problem with test results, which helps when dealing with the shop.

If, on the other hand, the whine is quiet and only appears in game menus, it's usually more sensible simply to cap the frame rate rather than spend time on warranty procedures: noise like that doesn't affect how the device works or how long it lasts.

Need advice?

If your computer has started whining and you're not sure whether it's normal or a sign of a fault, call a technician. We'll come to any district of Tbilisi, find the source of the noise, check the power supply and suggest a solution. Find out more on our "Noisy computer" and component replacement pages.