SilenX Series Quiet Fans feature the first fan blade designed for optimal airflow and aerodynamics. SilenX iXtrema Pro Series Quiet Fans are the result of thousands of hours of testing and fluid dynamics simulations. The result is a fan that can push more air per revolution at lower noise levels than any other fan available and proof that SilenX delivers the best in silent computing. Reduced motor size, increase fan blade surface, lower lateral surface area on the motor vanes along with silicon-composite fan mounts puts their fans above the rest.