silent fans

3 pin is 3 pin, molex is like a larger version with 4 pins

---------- Post added at 04:20 PM ---------- Previous post was at 04:18 PM ----------

3 pins are controllable via case controller OR mobo controller. Molex cannot be controlled and will be a constant rpm. Molex MAY be controlled by case IF the case supports it. It is often better to get 3 or 4 pins.
 
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