. CX Series Modular power supply units are an ideal choice for basic system builds & desktop PC computer upgrades offering high reliability low noise & the flexibility of modular cabling.80 plus bronze certified efficiency & clever fan design allow for little or no detectable fan noise during regular operation. The matte black finish black-sleeved cables & black connectors help give your system a restrained high-tech look. Since the peripheral power cables arent hard-wired to the power supply you can connect only the cables you need for your exact configuration of PCI-E cards & storage devices. Once youve installed a PSU you shouldnt have to think about it. Employing a thermally controlled fan makes the CX Series Modular quieter at idle & the large diameter reduces noise even when youre pushing your system hard..