4 Pin Pc Fan Connector Pinout

4 pin connectors are usually used by cpu fans with higher power consumption.

4 pin pc fan connector pinout.

2pcs 4 pin pwm fan extension cable and 4 pin ide to 3x 4 pin fan connector sleeved braided y splitter for computer pc 4 pin fan extension power cable cooling fans cable 5 0 out of 5 stars 3 3 99 3. If you want to use the pwm function then the 4 pin fan must be connected to a 4 pin header on the motherboard. 3 pin connectors are usually used for the smaller chassis fans with lower power consumption. 3 pin fan and 4 pin motherboard connector compatibility.

Seasonic focus plus gold platinum 650w also has only one 4 4pin cable to have two 4 4pin cables you need to buy at least a 750w psu. Fan has a 3 pin power connector. Straight power 11 650w has one 4 4pin cable 750w has one p8 8pin i suppose and one p4 4 connector. A fan with a 3 pin power connector may be easilly fitted into desktop board with a 4 pin fan header.

Fans and on board fan headers are backwards compatible. Three wire and four wire fan connectors. If you connect the 4 pin fan connector to a 3 pin header then the fan will run at maximum rpm. You can connect a 4 pin fan to a 3 pin or 4 pin header on the motherboard.

Vice versa it is possible to use old 3 wire fan on new board with 4 wire header but with limited possibility of pwm control depending on board logic. The tacho signal from the fan sinks to ground for every revolution the input on the motherboard is pulled high. Teoretically is possible to use 4 wire fan like 3 wire on the board with 3 wire connector. Proper fan connector placement is shown in the figures below.

Fan uses control ic bd6709nfs from rohm company. Desktop board has a 4 pin fan header. When using a 3 pin power connector with a 4 pin fan header the fan will always be on. Chassis and cpu fans may use either 3 pin or 4 pin power connectors.

Update october 13 2008. Rgb case fans 3 pack gim 120mm chassis fans 366 modes with controller and remote pc computer led fan reinforced quiet fan blade design adjustable colorful cooling cooler 4 6 out of 5 stars 181 19 98 19. A four pin connector is a little different than the three pin connector since it has the extra fourth wire used for controlling and sending signals to the fan which likely has a chip on it that tells it to slow down or speed up in addition to the other wires the three pin connector has.