Expand Your Ventilation Even if you don't have enough fan headers on your mainboard, the case fan hub expands your system by nine more case fan slots. Centralised Cable Management Synchronous Fan Control PWM. signal is passed on synchronously to all fans connected to the Case Fan Hub. The rpm of the first fan slot will be read out and returned to your system. External Power Supply The fans are powered directly from your power supply via SATA Power. As a result, there is no voltage loss at the fan speed, and smooth, smooth operation is made possible.