Can I Connect 3 Pin Fan To 4 Pin Motherboard

Fans andon board fan headers are backwards compatible. The cpu cooler fan i bought is a 4 pin. When using a 3 pin power connector with a 4 pin fan header the fan will always be on.

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Pwm fans come with a 4 pin connectors for fully automatic speed control via your mainboard s 4 pin pwm fan headers.

Can i connect 3 pin fan to 4 pin motherboard.

My rig has 2 pairs of 3 pin fans phanteks ph140sp connected to two 4 pin motherboard headers asus z97m plus via basic y splitters and they work and control just fine. 4 pin fan controllers hand off the pwm signal to the fan itself and these fan controllers supply an uncontrolled a 12vdc. Fans and on board fan headers are backwards compatible. I bought a noctua 2 nh d9l and its fits perfectly in the case however i noticed the motherboard pins for the cpu fan are a 5 pin connection.

3 pin connectors are usually used for the smallerchassis fans with lower power consumption. Even if you put a 3 pin fan into a 4 pin motherboard slot you still can control fan speed on whatever motherboard you have. Speed control options rpm range will vary between fans and motherboards on a 3 pin connection but the fan will spin. 3 pin fans will power up at 4 pin connectors but only at full speed.

You can plug a 3 pin fan into a 4 pin header just fine. 4 pin connectors areusually used by cpu fans with higher power consumption. Chassis and cpu fans may use either 3 pin or 4 pin powerconnectors. If you connect the 4 pin fan connector to a 3 pin header then the fan will run at maximum rpm.

Proper fan connector placement is shown in the figures below. Please note that 4 pin fans can also be connected to your mainboard s 3 pin fan headers though. You can connect a 4 pin fan to a 3 pin or 4 pin header on the motherboard. This is probably why they are not able to speed control your fan.

If you want to use the pwm function then the 4 pin fan must be connected to a 4 pin header on the motherboard. Just slide the 3 pin and leave the extra pin. When connected to 3 pin fan headers the fan will run at full speed unless the mainboard supports voltage based speed control. Is there a possible way to for this to work.

They are both compatible. I have a hp z420 and wanted to replace the cpu cooler. Desktop board has a 4 pin fan header. There is no fan control.

Fan has a 3 pin power connector.

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