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System Fan has a Molex connector, should i plug it in?

So i just finished building my first build today and everything is running smooth as butter and im absolutely loving this rig. My only question is that the fan that came with the case has two molex connectors attached to the wire connected to the motherboard. That fan is working without the Molex connectors being connected so should i bother connecting them? What is the point of the molex connectors if the fan is already getting power from the motherboard?
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  1. Best answer
    From what you described, it sounds like you can plug it into either, one for stable rpms, and the other for motherboard monitoring. I would say leave it on the board if its working fine.
  2. Nope, don't have to connect them if hooked to the motherboard.
    The molex connectors just give you the option to run the fan(s) directly off the PSU at full speed, and you can daisy-chain a couple fans together (look at the connectors, they are probably a combination male/female plug). The fans don't draw much current so using the direct connection or the mobo connection probably won't make any difference in available power; but if your mobo also controls fan speeds, either through software, bios, or heat sensing, then the mobo is the connection of choice.
  3. Gam3r01 said:
    From what you described, it sounds like you can plug it into either, one for stable rpms, and the other for motherboard monitoring. I would say leave it on the board if its working fine.


    typing at the same time, you had a shorter answer. Great minds think alike!
  4. nostall said:
    Gam3r01 said:
    From what you described, it sounds like you can plug it into either, one for stable rpms, and the other for motherboard monitoring. I would say leave it on the board if its working fine.


    typing at the same time, you had a shorter answer. Great minds think alike!


    You also summarized my setup too, I have 3 fans all chained together haha
  5. Thank you so much to the both of you! (wish i could select both as "best solution").
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