Variable-speed fan controllers for computers usually use PWM
(Pulse-width modulation), as it is far more efficient when compared to
the traditional one. The PWM technology allows the 4-pin fan to be more
temperature-sensitive, so that the turning-speed can be adjusted automatically
over the BIOS setup if your mainboard supports this specification.
Size (mm):
80 x 80 x 25 (ball
bearing)
Volt (DC):
12V
Speed (RPM):
950~3600
Airflow (CFM):