Can I Connect 3 Pin Fan To 4 Pin Motherboard

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. 3 pin connectors are usually used for the smallerchassis fans with lower power consumption. 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.

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Fan has a 3 pin power connector.

Can i connect 3 pin fan to 4 pin motherboard.

Just slide the 3 pin and leave the extra pin. If you connect the 4 pin fan connector to a 3 pin header then the fan will run at maximum rpm. When connected to 3 pin fan headers the fan will run at full speed unless the mainboard supports voltage based speed control. 4 pin connectors areusually used by cpu fans with higher power consumption.

Proper fan connector placement is shown in the figures below. This is probably why they are not able to speed control your fan. I have a hp z420 and wanted to replace the cpu cooler. 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.

Fans andon board fan headers are backwards compatible. Please note that 4 pin fans can also be connected to your mainboard s 3 pin fan headers though. The cpu cooler fan i bought is a 4 pin. 3 pin fans will power up at 4 pin connectors but only at full speed.

If you want to use the pwm function then the 4 pin fan must be connected to a 4 pin header on the motherboard. 4 pin fan controllers hand off the pwm signal to the fan itself and these fan controllers supply an uncontrolled a 12vdc. Is there a possible way to for this to work. There is no fan control.

You can plug a 3 pin fan into a 4 pin header just fine. Desktop board has a 4 pin fan header. They are both compatible. Chassis and cpu fans may use either 3 pin or 4 pin powerconnectors.

Speed control options rpm range will vary between fans and motherboards on a 3 pin connection but the fan will spin. When using a 3 pin power connector with a 4 pin fan header the fan will always be on. Pwm fans come with a 4 pin connectors for fully automatic speed control via your mainboard s 4 pin pwm fan headers. You can connect a 4 pin fan to a 3 pin or 4 pin header on the motherboard.

Fans and on board fan headers are backwards compatible.

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