If NASA Designed a Computer Case Fan – This Would Be It Corsair ML Series of PWM fans magnetic levitation technology & custom engineered rotors provide unrivaled performance & low noise Thanks to its innovative design the ML Series fans delivers both high static pressure & high air flow for a superior fan experience. Magnetic Bearing Harnesses magnetic levitation technology to provide lower noise higher performance & a longer lifespan. Custom Rotor Design Delivers the perfect balance between high static pressure & high airflow operating flawlessly in the most challenging environments Extensive Control Range A 1600 RPM PWM control range gives you total control between low noise & absolute performance. With a 1600 RPM PWM control range The ML Series fans deliver total control between low noise & airflow without compromise. Contents & Specifications. Package contents (x 2) ML140 140mm PWM Premium Magnetic Levitation Fan. Fan mounting screws System Requirements Motherboard with an open standard 4-pin fan connector.