Case fans on molex?

[Lena__]

Hello!
Short version:
Put case fans on molex chain and they go FULLPOWER, yes? Or even above their specs and unsave?

Long version:
So there are two 120mm placings in the front of my case, suppose intake. But only one "case_fan" header on mobo is reachable without putting cables in the way. So I used the 4pinx1->*pinx2 splitter that came with AIO. Works super silent and, since cpu cooling is overdone, super slow. Switched splitter with molex for now. I don't mind the roaring, but is it normal for fans themselves?

 

[grimfox]

When you plug the fans into a molex connection they no longer have that control signal so they run at full power. It's likely not harmful to the fans. You probably want to get a fan controller to maintain that control signal.

 

[feelinfroggy777]

This will be perfectly safe. You just wont have control over the speeds so they will run at full speed. If you want less noise, then you will need a controller, if you don't mind the noise, then go with the molex and enjoy.

 

[Zerk2012]

Some fans only come with a Molex pulg. 12 volt motor 12 volt Molex nothing to harm their made to run on 12 volts.

 

[unikinqay]

Just connect two molex pins together (not three or four) and you will be getting lower voltage aka lower fan speed. Preferably use copper wires to connect it.

 

[Zerk2012]

Just connect two molex pins together (not three or four) and you will be getting lower voltage aka lower fan speed. Preferably use copper wires to connect it.

No.

 

[unikinqay]

Just connect two molex pins together (not three or four) and you will be getting lower voltage aka lower fan speed. Preferably use copper wires to connect it.

No.

It works just fine. Working for 13 years and counting. It's basically the same as a 4-pin molex to 2/3-pin fan connector.

https://www.links.hr/hr/kabel-delock-2-pin-m-na-3-pin-molex-z-za-ventilator-cpu-hladnjak-30cm-052799171

 

[madmatt30]

^ running more than one doesn't drop the voltage - the voltage remains 12v & both fans will still run full speed.

A 7v mod yes - that's easily diable & will drop fans to 60% speed.

 

[unikinqay]

^ running more than one doesn't drop the voltage - the voltage remains 12v & both fans will still run full speed.

A 7v mod yes - that's easily diable & will drop fans to 60% speed.

I don't know, but I have connected 2 out of 4 molex pins (as was listed in Antec's case manual when using fan in silent mode) and it worked, rpm dropped considerably.

 

[Zerk2012]

That will not drop the volts.
I guess you could put a resistor in line and drop it but just a wire does nothing.

 

[madmatt30]

7v mod is fine , drops fans to lower speed & is a straight wire switch swapping the ground to the inside of the 12v pin to the 5v line

Not do be done on the actual PSU cable though - only on the fan to molex female adapter cable