80 PLUS Bronze Certified The ARC 550 Watt power supply is 80 PLUS Bronze certified and delivers up to 85% efficient performance under typical loads. This high form of efficiency saves energy, reduces heat in your computer system, decreases fan noise and prolongs the PSU’s life span. Specifications Rosewill ARC Series STYLE CONNECTOR TYPE ARC 450 ARC 550 ARC 650 ARC 750 20+4 Pin x1, 19.7 in x1, 19.7 in x1, 19.7 in x1, 19.7 in 4+4 Pin - EPS x1, 19.7 in x1, 19.7 in x1, 19.7 in x1, 19.7 in Single PCI-E x1, 19.7 in - - - Split PCI-E - x1, 19.7, 25.6 in x2, 19.7, 25.6 in x2, 19.7, 25.6 in Molex + 4 Pin Floppy x1, 19.7(m), 25.6(m), 31.5(m), 37.4(f) in x1, 19.7(m), 25.6(m), 31.5(m), 37.4(m), 43.3(f) in x1, 19.7(m), 25.6(m), 31.5(m), 37.4(m), 43.3(f) in x1, 19.7(m), 25.6(m), 31.5(m), 37.4(m), 43.3(f) in SATA Only x2, 19.7(s), 25.6(s) in x2, 19.7(s), 25.6(s), 31.5(s) in x2, 19.7(s), 25.6(s), 31.5(s) in x2, 19.7(s), 25.6(s), 31.5(s) in *LEGEND: (in) - inches, (m) - Molex Connector, (s) - SATA Connector, (f) - Floppy Connector