Plugging in fans

So I'm putting together my first build today, Everything seems to be going smoothly, but one thing is confusing me. When it comes to the case fans there are both a small 3 pin connector which plugs into the motherboard, and a (i think it's called) 4 pin pass through molex connector. so here is my question: should I plug in both the small 3 pin thing to the motherboard AND male molex from psu into the pass through, or just one or the other, Thanks guys!
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  1. Best answer
    connect the 3 pin case fans directly to the motherboard as that lets you control the speeds of the fans. no just use either 3pin mobo header or 4 pin molex to connect directly to your psu (no fan control)..dont use both
  2. Best answer selected by atza56.
  3. thanks! i was really confused there , So I'll disconnect the molex from all the fans
  4. also Connecting Fans to mobo 3 or 4 pin makes less noise..

    From PSU full speed -- > full noise.
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