Electrical Buzzing or Coil Whine from Mini PC

Article ID Code: GK-FAN-04

This article covers electrical buzzing, humming, or coil whine — a type of noise that is distinct from fan mechanical noise. It is typically a high-pitched or low-frequency electrical sound that occurs at regular intervals or under specific load conditions, even when the fan is running quietly.

What is coil whine?

Coil whine is a high-frequency vibration produced by inductors or capacitors on the motherboard's power delivery circuit under electrical load. It is a known characteristic of modern electronics and is not always a defect. It typically sounds like a faint high-pitched whine, buzz, or chirp, and may occur at regular intervals or when the CPU/GPU changes power states.

It is generally considered normal if:

• The sound is faint and only audible in a very quiet room.
• The device functions normally with no crashes, errors, or performance issues.
• CPU and system temperatures are within normal range (idle <50°C).

It may indicate a fault if:

• The buzzing is loud enough to be heard from a normal working distance.
• The sound is accompanied by system instability, crashes, or unexpected shutdowns.
• The noise started suddenly after previously being absent.

Step 1: Confirm the noise source is electrical, not mechanical

1. Download Core Temp and monitor CPU temperature while the noise occurs.
2. If CPU temperature is normal (below 50°C at idle) and the fan speed is low, the noise is electrical, not fan-related.
3. Try changing the Windows power plan: Settings → System → Power & sleep → Additional power settings → switch from High performance to Balanced. This reduces rapid CPU power state changes that trigger coil whine.
4. Test whether the noise changes or stops when switching power plans — this confirms the source is the power delivery circuit.

Step 2: Reduce electrical noise from power delivery

1. Use the original GEEKOM power adapter. Third-party adapters with different ripple characteristics can amplify coil whine.
2. Try a different wall outlet or power strip. Electrical noise from the mains supply can be picked up by the device's power circuit.
3. Update BIOS and EC firmware from service.geekompc.com — firmware updates sometimes include power management improvements that reduce coil whine.
4. In BIOS, try changing PowerMode from Performance to Normal or QuietMode (Advanced tab → PowerMode → F4 to save). Lower power states reduce the frequency of power delivery switching that causes the noise.

Final Recommendation

If the electrical noise is loud, worsening over time, or accompanied by system instability, contact GEEKOM Customer Service and provide:

• Product model and serial number
• A short audio or video recording of the noise
• Description of when the noise occurs and whether it affects system stability
• Current BIOS version (visible in BIOS or via msinfo32 → BIOS Version)

Related articles

• GK-FAN-01: How to Solve Fan Noise
• GK-FAN-02: Abnormal Fan Noise
• GK-FAN-03: Fan Noise on a New or Recently Unboxed Device