The Thermaltake Toughpower QFan 650W Modular Power Supply uses a special five way air-intake housing design to create the best heat dissipation environment for the non-frame 140mm QFan at minimal noise level. Therefore, the fan at low speed setting yield a 17.1 dBA without compromising performance.
The 140mm QFan features a unique patent designed blade shape and a 360°non-frame, effectively reducing the noise level. The air inlet is designed to increase air flow and reduce the sound of wind shear.