guide · static export
Hardware

Diagnose Coil Whine and Fan Rattle

A high-pitched whine under load and a rattle at low speed are different faults. One is electrical and harmless, the other is mechanical and fixable.

by@guidox updated:10/31/26 time:25 min level:Beginner tested on:Windows 11 24H2 works on:Any desktop PC tools:Phone recorder
TL;DR

Isolate the source by **stopping fans one at a time**, then separate **electrical whine** (changes with load and frame rate) from **mechanical rattle** (changes with speed and position).

Before you start

Requirements

  • A phone to record the sound
  • Ten minutes
  • A thin card or a finger to stop a fan
Step by step

Instructions

01

Record it before you open anything

A phone recording with the case closed tells you the frequency and whether it follows the load. It also gives you a baseline to compare after each change.

02

Stop the fans one at a time

Briefly hold a fan still with a soft object and listen. Whine that continues belongs to the electronics; a rattle that stops identifies the fan, the bearing or a loose cable touching the blades.

⚠ warningNever stop a fan with a hard tool or a screwdriver. A soft plastic card or your finger on the hub is enough.
03

Test the whine with a frame rate cap

Coil whine follows the switching frequency of the power stages. Cap the frame rate or open a static menu and listen: if the pitch changes with the frame rate, it is the graphics card, not the power supply.

tipA menu screen that runs at unlimited frames can whine louder than the game itself. Capping at the refresh rate often removes it entirely.
04

Check the mounting points

A rattle at one specific speed is usually a resonating panel, a cable touching a blade or a fan screw that is not tight. Press a finger on the side panel while it runs; if the noise stops, you found the panel.

05

Decide what is worth replacing

Electrical whine is not a defect and cannot be repaired, only mitigated with a frame cap or a different power supply. A rattling bearing gets worse and is worth replacing while the fan is still available.

06

Verify after the change

Record the same scenario again at the same distance. Human memory for noise is short, and a recording made before and after is the only honest comparison.

Troubleshooting

Common issues

The whine only appears in menus

Uncapped frame rate. Cap it to the refresh rate and the switching frequency leaves the audible range.

A tick once per revolution

A cable touching the blades or a bearing. Route the cable first, replace the fan if the tick stays.

The noise comes and goes with temperature

A fan bearing that only complains cold, or a panel resonating at one speed. Change the curve slightly to test.

It got worse after a new power supply

Different switching frequency, not a fault. The older unit was quieter by luck, not by design.

FAQ

Frequently asked

Is coil whine dangerous?

No. It is vibrating components, not a failing part, and it does not shorten the hardware's life.

Does a different case help?

Dampened panels help with rattle and resonance, not with electrical whine.

How to undo this

Remove the frame cap or restore the previous fan curve if you changed it. No component is modified by the diagnosis.

Changelog · 1 entry
  1. 2026-10-31
    First version
Interactive version: checklist, feedback, related guides →

Free · no account needed · tracks your progress