Viking2121 said: 4 pin = They have a 12v wire and a 5v wire along with a ground and sensor wire. a 4 pin can use less power then that of a 2 pin fan. I have a high static pressure fan in my system (Ultra Kaze 3pin) which uses 0.67amps at 12v which is 8 watts. 0.67a x 12v = 8.04 watts.
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