The 4 th pin found on some case fans allows for pwm pulse width modulation control which allows your motherboard or fan control software to adjust the speed of your fan.
Corsair h100i 3 pin fans.
And the 3 pin with only a single sensor wire fan connector should be plugged into your cpu fan header.
3 pin versus 4 pin pwm a regular 3 pin fan has wires for power ground and tach tach relays information to your motherboard or software like rpm.
H100i v2 3 pin fans speed control cooling.
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The corsair hydro series h100i rgb platinum is an all in one liquid cpu cooler with a 240mm radiator and vivid rgb lighting that s built for extreme cpu cooling.
The corsair user forums corsair product discussion cooling.
The hydro series h100i is a high performance all in one liquid cpu cooler from corsair.
The h100i is similar to other hydro series cpu coolers from with a few exceptions the main one being that the h100i uses a longer 240mm radiator.
Now the hydro series h100 is completely installed and there is still plenty of room to fill up all the motherboards dimm slots with some of our tallest vengeance memory which measures 52mm in height.
Zero rpm cooling profiles in corsair icue software allow fans to stop entirely at low temperatures eliminating fan noise.
The h100 is powered by the 4 pin peripheral cable while the 3 pin fan header sends pump rpm information to your motherboards bios.