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Small square 12V PWM cooling fan 40 by 40 by 10mm 5000 RPM

LORDWORLD

LORDWORLD 12V PWM Cooling Fan 40×40×10mm 5000RPM for CM4 IO Board

SKU CH-M0HZ-RBCE9

Cools the Compute Module 4 IO board with a 40×40×10 mm 12 V PWM fan running at 5000 RPM

  • Fits Compute Module 4 IO Board and CM4-IO-BOARD-CASE-A
  • 4-pin reverse-proof connector prevents incorrect installation
  • 12 V PWM speed control adjusts cooling to load
  • Compact 40×40×10 mm frame fits tight enclosures
  • 5000 RPM airflow keeps the board cool under load

CM4 IO Board cooling fan

This 12V PWM fan is built specifically for the Compute Module 4 IO Board and the CM4-IO-BOARD-CASE-A enclosure. It connects through a 4PIN reverse-proof connector that prevents incorrect insertion. The 40×40×10mm frame fits the designated mounting points on the board. Speed is adjustable via PWM so the system can balance airflow and noise.

Upgrade from passive cooling

Passive heatsinks on the CM4 IO Board can saturate under sustained compute loads, causing thermal throttling. Adding this fan moves air directly over the module and power circuitry, keeping clocks stable during long builds, compile jobs or data-logging sessions. The jump is worth it whenever the workload runs for minutes rather than seconds, or when the enclosure limits natural convection.

12V PWM interface limits

The fan requires a 12V PWM header; it will not run from a 5V fan connector or a simple two-wire header. Speed control depends on the board generating a PWM signal — without it the fan stays at full 5000 RPM or does not start, depending on the header implementation. The reverse-proof connector only fits one way, so builders must align the key before seating it.

Highlights

  • Fits Compute Module 4 IO Board and CM4-IO-BOARD-CASE-A
  • 4-pin reverse-proof connector prevents incorrect installation
  • 12 V PWM speed control adjusts cooling to load
  • Compact 40×40×10 mm frame fits tight enclosures
  • 5000 RPM airflow keeps the board cool under load

Specifications

BrandLORDWORLD

Questions about this item

Will the 40×40×10 mm fan fit the CM4 IO Board mounting holes?

The fan is designed specifically for the Compute Module 4 IO Board and the CM4-IO-BOARD-CASE-A, so the 40×40×10 mm frame aligns with the board's mounting pattern.

How do I connect the 4-pin reverse-proof connector without damaging the header?

Align the keyed 4-pin plug with the board's fan header — the reverse-proof design prevents backward insertion — then press straight down until seated; the PWM wire carries the speed signal.

When should I replace the 12 V 5000 RPM fan?

Replace it if bearing noise increases, airflow drops noticeably, or the PWM speed no longer reaches 5000±10 % RPM under load.

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