The Corsair CXM Series CXM550 550W Power Supply (CP-9020102) modular power supply offers high reliability, low noise, and the flexibility of modular cabling. 80 PLUS Bronze certified efficiency and clever fan design allow for little or no detectable fan noise during regular operation. The modular cabling system lets you use only the cables you need. You get to save space and reduce clutter for a cleaner-looking build and improved airflow. CX Series Modular is built and tested to strict standards for trouble-free installation and smooth operation.