EVGA 550 B5 80 PLUS Bronze 550W Fully Modular ATX Power Supply EASILY POWER THE MOST DEMANDING SYSTEMSIntroducing the EVGA B5 power supplies, the latest 80PLUS Certified Bronze power supplies to carry on the EVGA tradition of reliability, performance, and affordability. The B5 power supplies start with the most important standard for reliability - a Japanese main capacitor. Next, the B5 power supplies provide maximum flexibility by using a small chassis and a fully modular design. The ultra-quiet 135mm Fluid-Dynamic Bearing fan becomes silent when coupled with EVGA ECO mode to turn off the fan in medium to low loads. Last, but not least, the B5 power supplies have a full suite of protections and a 5-year limited warranty that you\'ve come to know and expect from EVGA. HARDWARE PROTECTIONWhile being silent, the B5 also has a large single 12volt rail, providing plenty of power to fuel all of your hardware. A full suite of top tier circuit protections keep you running strong and your hardware safe.• OVP (Over Voltage Protection)• UVP (Under Voltage Protection)• OCP (Over Current Protection)• OTP (Over Temperature Protection)• OPP (Over Power Protection)• SCP (Short Circuit Protection) SINGLE +12V RAILEnjoy great power output, rail stability and compatibility with the latest hardware. The B5 provides up to 70.8A respectively on a single rail. FULLY MODULARThe Fully Modular design makes installation and removal easier than ever, reduces clutter and enhances case airflow. Fluid-Dynamic Bearing fanA high-quality fluid-dynamic bearing fan gives the B5 an excellent thermal and acoustic profile, along with reliability and a long PSU lifespan. BRONZE Rated EFFICIENCYThe 80 Plus Bronze certification ensures your power supply doesn\'t waste power. Under typical load the B5 is 85% efficient.