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. Seasonics B12 BC Series is an economical choice with great performance and high built-in value. Specifications Cooling Fan diameter: 12 cm Number of fans: 1 fan(s) Fan location: Top Cooling type: Active Performance On/off switch: Yes Power supply unit (PSU) form factor: ATX 80 PLUS certification: 80 PLUS Bronze Purpose: PC Mean time between failures (MTBF): 100000 h Certification: cTUVus, TUV, CB, CCC, BSMI, CE, FCC Bearing technology: Sleeve Design 80 PLUS certification: 80 PLUS Bronze Certification: cTUVus, TUV, CB, CCC, BSMI, CE, FCC Product colour: Black Cooling type: Active Power Total power: 850 W AC input voltage: 100 - 240 V AC input frequency: 50/60 Hz Input current: 10 A Combined power (+3.3V): 100 W Combined power (+12V): 840 W Combined power (+5V): 100 W Combined power (-12V): 3.6 W Combined power (+5Vsb): 12.5 W Max output current (+3.3V): 15 A Max output current (+12V): 70 A Max output current (+5V): 15 A Max output current (-12V): 0.3 A Max output current (+5Vsb): 2.5 A Power protection features: Over current, Over power, Over voltage, Short circuit Ports & interfaces Motherboard power cable length: 55 cm CPU power cable length: 60 cm Motherboard power connector: 20+4 pin ATX Number of SATA power connectors: 6 Peripheral (Molex) power connectors (4-pin): 3 PCI Express power connectors (6+2 pin): 4 CPU power connector (4+4 pin): Yes PCI Express connector: Yes ATX power connector (20+4 pin): Yes Cabling type: Non-Modular EPS power connector (4+4 pin): Yes Operational conditions Operating temperature (T-T): 0 - 50 C Weight & dimensions Width: 150 mm Depth: 140 mm Height: 86 mm Technical details Sustainability certificates: CE, ENERGY STAR, REACH, RoHS, WEEE Certificates 80 PLUS certification: 80 PLUS Bronze Certification: cTUVus, TUV, CB, CCC, BSMI, CE, FCC