The B12 BC Series is available in the standard ATX Form Factor and in wattages that are most common for a PC system. The Seasonic B12 BC achieves 80 PLUS Bronze standard of providing at least 82 , 85 and 82 power usage efficiency at 20 , 50 and 100 operating loads, respectively. This efficiency, combined with Active Power Factor Correction, enables the B12 BC series power supplies to lessen energy waste, which translates into savings on the costs of energy costs for its users. In addition to being greatly efficient, the B12 BC units utilize the LLC resonant converter design, and the industrys leading Smart and Silent Fan Control (S2FC). 80 PLUS BRONZE The 80 PLUS Bronze certification indicates that a high percentage of the electricity is converted into useful power, therefore there is less heat lost and more money saved on the electricity bill. The 80 PLUS Bronze certification guarantees greater than 82 , 85 and 82 efficiency at 20 , 50 and 100 operating loads, respectively. Sea Sonics B12 BC Series is an economical choice with great performance and high built-in value. S2FC - SMART AND SILENT FAN CONTROL The intelligent thermal circuit feature is designed to find the optimal balance between the necessity to cool the components and the need to run the power supply in the most silent manner possible. Main Features 80 PLUS Bronze certified Fixed cables Tight Voltage Regulation S2FC - Smart and Silent Fan Control 5 years warranty Interfaces/Ports SATA Connectors3 CPU Connectors1 x 4 4-pin EPS PCI Connectors2 x 6 2-pin PCIe Motherboard Connectors1 x 24-pin ATX Molex Connectors3 Compliance Standards80 PLUS Bronze CertifiedcTUVus, TUV, CB, CCC, BSMI, CE, FCCEnergy Star, RoHS, WEEE, ErP Lot 6, REACH SafetyOPP, OVP, OCP, SCP Electrical Voltage100 ~ 240 V AC Power550 W Frequency Range50 ~ 60 Hz Power CordYes Environmental Operating Temperature0 ~ 50C Physical Form FactorATX Power Supply Case ColourBlack In The BoxPower SupplyScrewsPower CableInstallation Guide Width150 mm Depth140 mm Height86 mm Warranty Warranty5 Years Key Features Modular CablesNo 80Plus Rated80 Plus Bronze PSU Form FactorATX PCI-E Connectors2 Motherboard Power Connectors4 4-Pin PCI-E Pin Type6 2-Pin PSU Depth140 mm