N newby1953 Reputable Nov 7, 2014 5 0 4,510 Sep 1, 2016 #1 repair 4wire cpu fan on compaq sr1803wm desktop.
Solution popatim Sep 3, 2016 no, 4th wire is the PWM signal. The first 3 wires are the same as a 3 wire fan , 12v, ground, & tach
popatim Titan Moderator Dec 2, 2009 38,904 980 135,890 Sep 3, 2016 Solution #2 no, 4th wire is the PWM signal. The first 3 wires are the same as a 3 wire fan , 12v, ground, & tach Upvote 0 Downvote Solution