The NF-A8 is a highly optimised. premium quality quiet 80mm fan. Featuring Noctua s AAO (Advanced Acoustic Optimisation) frame as well as sophisticated aerodynamic design measures such as Flow Acceleration Channels. the NF-A8 further improves the renowned quiet cooling performance of the award-winning NF-R8. The PWM version sports Noctua s custom designed NE-FD1 IC for fully automatic speed control via 4-pin fan headers and comes with a Low-Noise-Adaptor to reduce the maximum speed during PWM control from 2200 to 1750rpm. Its superb running smoothness. reference-class SSO2 bearing and Noctua s trusted premium quality make it an elite choice for the highest demands.