Riing Silent 12 Blue CPU Cooler The latest Riing Silent 12 CPU cooler is with PWM function, designed for use with high-end RAM and motherboards. A 120mm fan fitted to enhance the airflow produces impressive cooling performance with an optimized 11 fan-blade design. Hydraulic bearings for silent operation guarantee ultra-low noise. The patented LED ring maintains color and brightness uniformity, and the lighting effect is visible from all sides and angles. Eleven Fan Blade Design Eleven fan blades are engineered to create large volume of air passing through the heatsink at any angle and provide the best balance between silent and performance. Riing Silent 12 is with PWM function which allows the motherboard to r model : CL-P022-AL12BU-A tag : Computer Cases