Vszerda RDM1238B 120×120×38 mm case fan DC12V 0.40A 2-wire brushless

120 mm 38 mm-thick DC brushless fan

This Vszerda RDM1238B is a 120 mm square frame fan with a 38 mm thickness designed for chassis cooling. It runs on DC 12 V and draws 0.40 A through a two-wire brushless motor. The unit suits builders who need a straightforward replacement or supplementary airflow device without PWM control.

Two-wire power limits speed control

The fan connects with a simple two-wire lead that supplies constant voltage. Because there is no third wire for tachometer feedback or fourth wire for PWM, the motherboard or controller cannot monitor rpm or vary speed automatically. Speed changes require an external voltage regulator or resistor cable, and the fan will always run at full voltage when plugged directly into a 12 V header.

Check header pins and mounting depth

Before ordering, verify that your case or heatsink can accommodate a 38 mm thick fan at the intended location. Confirm the fan header on your board or controller provides a standard two-pin 12 V connection; a four-pin PWM header will work electrically but will not enable speed control. Ensure the 120 mm screw spacing matches the mounting holes on your chassis or radiator.