Desktop board has a 4 pin fan header.
Can i connect 3 pin fan to 4 pin motherboard.
Chassis and cpu fans may use either 3 pin or 4 pin powerconnectors.
3 pin fans will power up at 4 pin connectors but only at full speed.
They are both compatible.
The cpu cooler fan i bought is a 4 pin.
When connected to 3 pin fan headers the fan will run at full speed unless the mainboard supports voltage based speed control.
You can connect a 4 pin fan to a 3 pin or 4 pin header on the motherboard.
4 pin connectors areusually used by cpu fans with higher power consumption.
You can plug a 3 pin fan into a 4 pin header just fine.
Fan has a 3 pin power connector.
There is no fan control.
Pwm fans come with a 4 pin connectors for fully automatic speed control via your mainboard s 4 pin pwm fan headers.
This is probably why they are not able to speed control your fan.
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.
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.
I have a hp z420 and wanted to replace the cpu cooler.
3 pin connectors are usually used for the smallerchassis fans with lower power consumption.
Fans andon board fan headers are backwards compatible.
When using a 3 pin power connector with a 4 pin fan header the fan will always be on.
Proper fan connector placement is shown in the figures below.
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.
Just slide the 3 pin and leave the extra pin.
Please note that 4 pin fans can also be connected to your mainboard s 3 pin fan headers though.
If you connect the 4 pin fan connector to a 3 pin header then the fan will run at maximum rpm.
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.