Toughpower XT Cable Management Proper airflow within computer system plays an extremely important role in making sure CPU, Graphic Card(s), Hard Drives and other critical components are getting adequate cooling. Thermaltake Cable Management Technology allows users to only use the cables needed from the power supply that reduces amount of cable clutter within the computer to improve cooling and reduce system noise. Watt P/N +12V PCI-Express SATA PFC Fan Certification Efficiency Noise 650 W0227RU  52A 6-pin x 2, 8-pin x 2 6 Active 140 MM 87% + 16 dBA 750 W0229RU  60A 6-pin x 2, 8-pin x 2 6 Active 140 MM 87% + 16 dBA 850 W0230RU  62A 6-pin x 2, 8-pin x 2 8 Active 140 MM 87% + 16 dBA 850 W0315RU  62A 6-pin x 2, 8-pin x 2 8 Active 140MM 87% + 16 dBA Toughpower XT Standard Built to the highest standard of circuitry design that elevates both power efficiency and stability, Toughpower is the leading standard in power supply. Watt P/N +12V PCI-Express SATA PFC Fan Certification Efficiency Noise 650 W0221RU  52A 6-pin x 2, 8-pin x 2 6 Active 140 MM 87% + 16 dBA 750 W0223RU  60A 6-pin x 2, 8-pin x 2 6 Active 140 MM 87% + 16 dBA 850 W0224RU  62A 6-pin x 2, 8-pin x 2 8 Active 140MM 87% + 16 dBA