Coil whine - what it is and whether it's a problem

You're in a game, frame rates are high, and there's a faint electronic whine coming from inside the case. Or it only appears when the PC is under load. Or it changes pitch depending on what's on screen. If any of that sounds familiar, you're almost certainly dealing with coil whine.

What coil whine actually is

Electronic components - inductors, capacitors, transformers - vibrate slightly when alternating current passes through them. At certain frequencies, that vibration falls in the range human ears can detect, producing a whine, buzz, or hiss.

It's a byproduct of normal electrical operation, not a sign that something is broken. The coils in your GPU's power delivery circuitry, your PSU, or your motherboard's VRM are the most common sources.

How to identify where it's coming from

GPU coil whine is the most common. It typically correlates directly with frame rate - the higher the frames, the higher the pitch or volume of the whine. Uncapped frame rates (running at 400fps in a menu, for example) often produce the loudest coil whine because the GPU is switching power extremely rapidly. Capping your frame rate via the driver settings or in-game limiter usually reduces it significantly.

PSU coil whine tends to be constant at a given load level rather than varying with frames. It's more noticeable under sustained heavy load and may change pitch as load changes.

Motherboard VRM whine is similar to PSU whine, correlated with CPU load rather than GPU activity.

To identify the source, hold a cardboard tube near the components one at a time while the PC is under load and the whine is present. It's a rough method but usually sufficient to isolate whether it's coming from the GPU or PSU area.

Is it actually a problem

In the vast majority of cases, no. Coil whine is a cosmetic issue - irritating, but not harmful to the component producing it or anything else. GPUs that have whined for years continue to perform identically to ones that don't.

That said, there are situations where a whine-like sound does indicate a real fault:

Coil whine that appears suddenly on a card that was previously quiet - especially if accompanied by instability, artifacts, or performance changes - warrants investigation. A damaged power stage can produce unusual electrical noise as a symptom of a deeper fault.

PSU whine that is new, getting louder, or accompanied by other symptoms - restarts, instability, burning smell - is different from normal PSU coil whine and should be treated as a warning sign.

Fan bearing noise is sometimes mistaken for coil whine. It's usually lower-pitched, more of a grind or rattle, and doesn't correlate cleanly with load. A failing fan bearing is a real fault - it will eventually cause the fan to fail and temperatures to spike.

What you can do about it

Cap your frame rate. This is the most effective fix for GPU coil whine. Limiting frames to your monitor's refresh rate (or 2x at most) removes the conditions that cause the worst whine. Nvidia users can set a frame cap in the driver; AMD users can use Radeon Chill or in-game limiters.

Enable V-Sync or G-Sync/FreeSync. These also reduce the uncapped frame rates that drive coil whine.

Check PSU placement and vibration isolation. Occasionally moving the PSU or adding rubber mounts reduces transmitted vibration to the case, which can dampen the audible effect.

Improve case damping. Sound-dampening foam panels on the side of the case reduce how much noise escapes - they don't fix the whine, but they reduce how much you hear it.

Beyond that, options are limited without replacing the component. Some GPUs simply whine more than others due to manufacturing variation - two identical cards from the same batch can behave differently in this respect.

When to send it in

If the whine is accompanied by any performance change, instability, or other symptoms - or if you're not certain the sound is coil whine rather than a fan bearing or something else - it's worth getting it confirmed. We can listen to and test the system under load and tell you whether what you're hearing is harmless or something to act on.