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Square 40mm black server fan with four-pin PWM cable

Ruth's sister

Ruth's sister DBTB0428B2G 40mm 12V 1A dual ball bearing 4-pin PWM internal power cable

SKU CH-77H8-VDH58

A 40 mm dual-ball-bearing server fan with 4-pin PWM control, spinning up to 18000 RPM and moving 19.4 CFM at 54 dB

  • High-speed cooling up to 18000 RPM
  • Dual ball bearing rated for 70000 hours
  • PWM intelligent temperature control adjusts fan speed
  • 4 CFM airflow in a 40×40×28 mm frame
  • 12 V 1 A power draw with 7.0–13.4 V operating range

40mm High-Speed Server Fan

The Ruth's sister DBTB0428B2G is a 40mm square fan designed for server cooling. It spins at up to 18000 RPM and delivers 19.4 CFM of airflow. Dual ball bearings provide a rated life of 70000 hours. A 4-pin PWM connector enables intelligent speed control based on temperature.

Check 12V PWM Header and Clearance

Verify that your motherboard or fan controller supplies a 4-pin PWM header within the 7.0 to 13.4V operating range. The unit draws 1A at 12V for 12W total power. Ensure 40mm mounting holes and 28mm thickness fit your chassis or heatsink without obstruction.

Suits High-Airflow Server Builds

This fan suits builders who need maximum airflow in a compact 40mm form factor for dense server enclosures. It is not for users who prioritise quiet operation, as radiator noise reaches 54 dB at full speed. Buyers needing larger diameter fans or lower noise profiles should consider alternative sizes.

How it compares

Measured against everything we stock in Internal PSU & Riser Cables, at today’s prices. Recalculated every night.

Price $10.99
Cheaper than about 70% of the 7,839 comparable items (median $14.99).

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Specifications

No published specifications for this item yet.

Questions about this item

Does the 40×40×28 mm fan ship with any mounting screws or extra cables?

The listing covers the 4-wire PWM fan unit only; mounting hardware and additional cables are not included.

Should I pick the 12 V 1 A DBTB0428B2G model or a lower-speed variant for a quiet build?

This model reaches 18000 RPM and 54 dB, so choose it only when maximum airflow of 19.4 CFM is required over silence.

What does the 18000 RPM rating mean once the fan is installed in a server chassis?

At full PWM duty the fan spins at 18000 RPM ±10 %, delivering 19.4 CFM through a 40 mm frame while drawing up to 12 W.

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