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Black 40mm square case fan with four-pin connector

SXDOOL

SXDOOL DBTA0420B2U 40mm 4-Pin PWM Case Fan 12000 RPM

SKU CH-K20H-JD9QB

40 mm dual-ball-bearing PWM fan spinning up to 12 000 RPM with 4-pin speed control

  • Fan size40 mm
  • Bearing design2 Ball
  • Rotational speed>7,000 RPM
  • Power input connector4 Pin
  • LED lightingNon-LED
  • Product typeCase Fan
  • High airflow in a 40 × 40 × 20 mm frame
  • Double ball bearing rated for 10.0000 hours at 25 °C
  • 4-pin PWM lets the motherboard control speed up to 12000 RPM
  • 12 V, 0.50 A draw keeps power demand low
  • Non-LED black design suits any build aesthetic

Targeted Cooling for Tight Spaces

This 40 mm case fan fits compact chassis and specialized heatsinks where larger units cannot mount. The 4-pin PWM connector allows the motherboard to regulate speed automatically based on temperature. It is not suited for builds that rely on a single large fan for silent whole-case airflow.

Thermal and Acoustic Profile

Double ball bearings support sustained operation at speeds above 7000 RPM while drawing 0.50 A at 12 V. The supplier rates the service life at 10.0000 hours at 25 °C and 45-85 % relative humidity. Expect noticeable airflow noise when the fan runs near its 12000 RPM ceiling.

PWM Control and Physical Fit

The 4-wire interface enables precise speed curves without additional software or controllers. Physical dimensions are 40 × 40 × 20 mm, matching the AVC 4020 form factor. No LEDs, mounting screws or adapters are included in the package.

How it compares

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

Price $7.99
Cheaper than about 93% of the 8,339 comparable items (median $19.99).
Fan size 40 mm
Lower than about 90% of the 1,114 comparable items (median 120 mm).

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Specifications

Product
Product typeCase Fan
Product colorBlack
Performance
Rotational speed>7,000 RPM
Power
Power input connector4 Pin
Size & build
Fan size40 mm
Bearing design2 Ball
More details
LED lightingNon-LED

Questions about this item

How do I install the 40 mm 4-pin PWM fan and which step do people get wrong?

Mount the 40 × 40 × 20 mm frame with four screws, connect the 4-pin PWM header to the motherboard, and enable PWM control in BIOS so the fan runs above 7000 RPM instead of staying at minimum speed.

What maintenance or replacement will the double ball bearing fan need later?

The double ball bearing is rated for 10.0000 hours at 25 °C and 45-85% RH; after that period the bearing may develop noise or vibration and the fan should be replaced.

What limit appears first during sustained 12000 RPM operation?

Continuous 12 V 0.50 A draw at 12000 RPM generates heat that can push internal temperatures beyond the 25 °C design point, causing the PWM controller to throttle speed to protect the motor.

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