The B12 BC series is available in the standard ATX form factor and in the most common wattages for a PC system. The Seasonic B12 BC achieves the 80 PLUS Bronze standard with an efficiency of at least 82%, 85%, and 82% at 20%, 50%, and 100% load, respectively. This efficiency, combined with active power factor correction, allows the B12 BC series power supplies to reduce energy waste, resulting in savings on energy costs for users. In addition to the high efficiency, the B12 BC units utilize LLC resonant converter design and industry-leading Smart and Silent Fan Control (S2FC).