If you connect the 4 pin fan connector to a 3 pin header then the fan will run at maximum rpm.
Multiple pc fan connector.
So i am assembling my pc for the first time and came in a bit of a glitch.
I read a few threads and i understood that i can connect two fans to one.
Connect the fan to the power supply.
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Using a screwdriver insert at least 4 screws into the corresponding holes in each corner of the case fan.
Next press down until the fan connector until it is fully connected to the motherboard header.
Locate any empty 4 plug power connector coming from the power supply and plug the fan into the connector.
So the motherboard asus b85m gamer i chose has only one fan header.
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.
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.