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 makes for an impressive cooling performance with an optimized 11 fan blade design the hydraulic bearings for silent operation guarantee ultra low noise and the patented led ring maintains the colour and brightness and the lighting effect is visible from all sides and angles key features middotnbsp