"The Antec Truepower Quattro 1000 watt power supply has earned its stripes, literally. With the racing inspired looks, the ability to start up and run a power hungry system with nary a hiccup speaks volumes about the power supply. If a power supply is struggling with a load, many times you can hear the fans or the water pump changing pitch during operation. I heard none of that with this power supply. In fact I never heard it at all. The ADDA fan used in the Quattro is 80 mm in size and rated at 40dba , 3400RPM and roughly 44CFM. The testing showed the airflow output under load right at 39 to 40CFM, meaning the fan was close to full song at this load level. Not once did I hear the fan spool up and become noisy."