The fan connector will have two guides 1 and these will need to line up with the tab 2 that is on the motherboard fan header.
Pc case fan power connector.
A three wire fan connecting to a four pin fan header.
If you connect the 4 pin fan connector to a 3 pin header then the fan will run at maximum rpm.
A computer fan is any fan inside or attached to a computer case used for active cooling fans are used to draw cooler air into the case from the outside expel warm air from inside and move air across a heat sink to cool a particular component.
Next press down until the fan connector until it is fully connected to the motherboard header.
Computer fans commonly come in standard sizes and are powered.
The four wire connectors are for processor fans with higher power consumption.
There is no fan control.
Both axial and sometimes centrifugal blower squirrel cage fans are used in computers.
3 pin connectors are usually used for the smaller chassis fans with lower power consumption while 4 pin connectors are usually used by cpu fans with higher power consumption.
As you can imagine these are the corresponding connectors for the power button and its corresponding led light if your case has one reset switch and your hdd light.
Say hello to your front panel cables.
There is no fan control.
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When using a 3 pin power connector with a 4 pin fan header the fan will always be on.
A four wire fan.
Fan has a 3 pin power connector.
When connecting a three wire fan to a four pin fan header the fan is always on.
Fans and on board fan headers are backwards compatible.
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The simplest pc fan requires just two wires one wire provides power 12v and the next.
Proper fan connector placement is shown in the figures below.
Most cooling fans will connect to a pc with a standard connector of some sort.
The three wire connectors are for small chassis fans with lower power consumption.
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Modern systems will typically use 3 pin or 4 pin dedicated fan headers though standard molex 4 pin peripheral.