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Old 05-18-2018, 05:31 AM
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Originally Posted by solarity View Post
Unless someone else can correct me, if I am wrong, but the HD-120 has always had 2x 4pin connectors. The 4th pin is PWM control, I think the SP-120s are 3 pin (ground, 12v, RPM/tach), compared to the HD-120 which are (ground, 12v, RPM/tach, PWM)
Totally correct dude.... both plugs have always been 4 pin on the hd series fans..
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