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Case fan came with molex connector, but it works without it ?

Last response: in Systems
January 8, 2012 9:58:30 PM

i bought a case fan

it works if I plug it straight in the motherboard

but it also came with a molex connector, it also works if I plug it in the motherboard through the molex conectro it came with

what is the difference

Or is this cable it came with meant to allow me to attach another fan ?
a c 78 B Homebuilt system
a b V Motherboard
January 8, 2012 10:03:16 PM

Motherboards have a varying number of fan connections. Some have one chassis fan and some have 3 or more chassis fan ports.

The MOLEX connectors are for the PCs with less chassis fan ports than chassis fans, so they can still use the fans somehow.
January 8, 2012 11:06:10 PM

oh right

what I have done is plug the fan straight into the motherboard

this won't make any difference in performance than when it was connected to the motherboard via the molex ?
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a b B Homebuilt system
January 8, 2012 11:17:50 PM

No difference in performance.
a b V Motherboard
January 8, 2012 11:51:01 PM

It is better to have the fans plugged into the motherboard pins because the motherboard will be able to read the sensor and fan speed and temp, etc.
When you use the molex connector, the motherboard won't see the fan.
a c 78 B Homebuilt system
a b V Motherboard
January 9, 2012 4:44:20 AM

Somebody please correct me if I am wrong on this but afaik the motherboard can only read/modulate fan speed from a 4 pin port and usually the only 4 pin port is CPU_FAN.

CHA_FAN chassis fan ports, in my experience, are usually 3 pin ports which means no fan speed modulation on these and no difference between these and a MOLEX.