If you CPU or case fan is too noisy, this reducer will silence them by reducing their voltage safely.  d

This one is 4 pin.\

About 11cm long, very good workmanship, just make sure it gets good air cooling as it will heat up a bit.

Name: 4Pin CPU fan speed down cable

Size: 12cm

Resistance: 27 ohms (about minus thirty percent RPM)

Interface: 3Pin interface (one male and one female)

Function: reduce fan voltage, thus reducing fan speed.

Use: fan for any 4pin interface

Features: the most economical cooling fan mute program

package include : 1x cable