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Small black square 40mm case fan with four wires

Fans

Fans PF40201BX-Q03U-SB9 40x40x20mm 4-Wire 12V 4.98W case fan

SKU CH-Z5J0-MJ8MT

40 mm square case fan with 4-wire PWM control draws 4.98 W at 12 V

  • 4-wire PWM control enables precise speed regulation
  • 12 V DC input suits standard server power rails
  • 98 W power draw keeps energy use low
  • 40 × 40 × 20 mm frame fits tight 1U chassis spaces

40 mm 4-wire server cooler fan

The PF40201BX-Q03U-SB9 is a 40 mm square case fan with a 20 mm thickness designed for server and compact system cooling. Its four-wire PWM connection allows precise speed control through the motherboard or fan controller. The unit operates on a standard 12 V supply and draws 4.98 W at full load. It suits builders fitting tight 1U chassis or refreshing legacy rack hardware.

Thermals noise and power draw

At 4.98 W the fan delivers targeted airflow for dense component layouts without exceeding typical header limits. The 40 x 40 x 20 mm frame fits restrictive ducts where larger rotors cannot mount. Four-wire regulation keeps acoustic output low during idle periods while ramping only when thermals demand it. Power consumption stays predictable across the control range.

How it compares

Measured against everything we stock in PC Cooling Fans, at today’s prices. Recalculated every night.

Price $14.99
Cheaper than about 67% of the 8,339 comparable items (median $19.99).

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Specifications

No published specifications for this item yet.

Questions about this item

How do I install the 40×40×20 mm fan and which step is often missed?

Mount the fan with four screws through the 40 mm frame, then plug the 4-wire PWM connector into the motherboard header; the step often missed is securing the fourth screw diagonally opposite the first to prevent vibration.

What maintenance or replacement will the 4.98 W 12 V server cooler need later?

Expect to clean dust from the blades every 6–12 months and replace the sleeve bearing assembly when noise or speed drop appears, typically after several years of continuous 12 V operation.

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