[風扇] PC chassis rear fan have both 3-pin and molex connector, need connect both

the Chassis rear fan is a Led fan, I never use led (RGB) fan  , the power cable of this fan have the 3-pin and molex connector linked together, do I need connect both, or either one is ok ?

is that mean molex for ALL time full speed, and just 3pin can let the system control the speed?


thanks , teach me some basic  on hoe to use them

in the front of the chassis, if I want more air flow, two x 140mm or three x 120mm , which set-up is better?

the top of the chassis have a magnetic mesh filter, if I want add fan on the top , the air flow should set be pull out like the rear? do I need to remove the magnetic top filter if top fan for air go out?


Please help, thanks

no pic?

1.  do I need connect both, or either one is ok ?
I think u can just try it out without damaging any part.

2. two x 140mm or three x 120mm , which set-up is better?
no big difference

3. the air flow should set be pull out like the rear?
top side push-out is usually better than a pull-in

4. do I need to remove the magnetic top filter if top fan for air go out?
It will reduce some airflow but also prevent a lot of dust free falling into the case, especially if you dont run your computer 7x24.

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