Silence-Optimized Operation: -Only 28dB(A) even at 100% PWM function: The Pure Wings 2 120mm PWM fan with high-quality rifle bearing facilitates the best balance between cooling performance and silent operation. -The nine blades of the fan are airflow-optimized to reduce noise-generating turbulence. -A high 150W TDP cooling efficiency. -Asymmetrical construction avoids blocking memory slots.