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2. Computer fan - Wikipedia

   en.wikipedia.org/wiki/Computer_fan

   This is a special variant of the Molex KK connector with four pins but with the locking/polarisation features of a three-pin connector. The additional pin is used for a pulse-width modulation (PWM) signal to provide variable speed control. [26] These can be plugged into 3-pin headers, but will lose their fan speed control.

3. Computer fan control - Wikipedia

   en.wikipedia.org/wiki/Computer_fan_control

   A PWM-capable fan is usually connected to a 4-pin connector (pinout: Ground, +12 V, sense, control). The sense pin is used to relay the rotation speed of the fan and the control pin is an open-drain or open-collector output, which requires a pull-up to 5 V or 3.3 V in the fan.

4. Talk:Computer fan - Wikipedia

   en.wikipedia.org/wiki/Talk:Computer_fan

   Some computer fans, especially smaller ones (80mm or less) use a 2-pin connector, which is present on graphics cards. It is somehow similar to the 3-pin Molex connector used for fans, but it is not just a 3-pin Molex with one pin less. You cannot plug these connectors into 3-pin Molex headers. Many of these fans can be found here e.g. and .

5. Power supply unit (computer) - Wikipedia

   en.wikipedia.org/wiki/Power_supply_unit_(computer)

   A power supply with a 24-pin connector can be used on a motherboard with a 20-pin connector. In cases where the motherboard has a 24-pin connector, some power supplies come with two connectors (one with 20-pin and other with 4-pin, i.e. 20+4-pin form) which can be used together to form the 24-pin connector.

6. Computer cooling - Wikipedia

   en.wikipedia.org/wiki/Computer_cooling

   A finned air cooled heatsink with fan clipped onto a CPU, with a smaller passive heatsink without fan in the background A 3-fan heatsink mounted on a video card to maximize cooling efficiency of the GPU and surrounding components Commodore 128DCR computer's switch-mode power supply, with a user-installed 60 mm cooling fan.

7. Dell Inspiron desktop computers - Wikipedia

   en.wikipedia.org/.../Dell_Inspiron_desktop_computers

   The motherboard also features four SATA 1.0 Ports, one EIDE (floppy) plug, three USB plugs for front USB, a Firewire plug, and a front audio plug. Cooling is somewhat limited, as the motherboard only provides one 4-pin PWM CPU fan plug, and one 3-pin rear fan plug. Installation of a fan controller will be required to use additional fans.