Do I need to plug my three pin led case fan in with molex if I have it also connected to the motherboard?

noah131

Honorable
Aug 27, 2013
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10,540
So, the other day I built my first computer, and I got it working, connected everything, but I noticed that from day one all of my case fans have been running at full power, and it's driving me crazy! If I have my three pin fans connected to my temperature monitoring motherboard, do I also need to have it connected to the PSU, for say, power for the leds?

On the plus side, my motherboard only runs at 20°C...