Arctic Cooling Fusion 550 Full Range Power Supply - Retail (PCACO-PS550-07A01) For the ventilation of the Fusion 550F - a single 80mm PWM fan is enough to cool down the PSU - It is the high efficiency of the PSU and the creative thermal management that makes this possible. Since the integrated ARCTIC F8 Pro fan comes with vibration absorption mounting frame, the noise is reduced to an absolute minimum. The Fusion 550F makes for a very reliable power supply unit for all midrange and high-end PC systems because of its 550 watt performance and up to 99% active PFC (Power Factor Correction rate). By using a powerful and efficient PSU, you save electricity cost every day. Taking the total cost of ownership into account (price of the product + average use over a certain time frame).