Am putting together a PC and have run into a problem with the MB/case. The case fan has a 3-hole connector and all system fan connectors on the MB are 4-pin. Case: Fractal Design Define R5 Black ...

On page 4, there is an "IDE Power" connector. It looks a lot like a 4 pin CPU fan connector, but it (obviously) provides different voltages that are appropriate for 3.5" IDE drives (5V ...

The TOUGHFAN EX Pro boasts a daisy chain compatible design, leveraging the MagForce 2.0 magnetic connector ... hard liquid crystal polymer blades, the fan minimizes vibrations during operation.