The Dynamic X2 GP-18 is a powerful 180 mm fan that packs a mean punch in the air-flow department. Massive blades, stout 38 mm thickness, and a wide 300-1200 RPM range with PWM control allow the GP-18 to yield remarkably high airflow while remaining exceptionally quiet. Optimized fan geometry - Optimized fan geometry balances airflow with extra emphasis on static pressure for great performance in any usage scenario - Trip Wire technology introduces a micro-turbulent layer that helps to combat elements that negatively affect performance, providing an overall more efficient and quieter fan environment - Fits standard 180 mm fan mounts with 165 x 165 mm screw hole pattern High-grade LLS bearing Long-Life Sleeve bearing with 90,000-hour MTTF delivers long-lasting dependability Notched blade design - Strategically placed notches near the fan hub on the trailing edge of the blades help to eliminate the humming noise produced when the blades pass stator struts - Aerodynamic stator struts with embedded wiring helps reduce noise and turbulence - Stator struts sit on a wide angle to the trailing edge of the blades, resulting in a lower noise level and smoother noise profile