EVGA Supernova 550 GS, 80+ Gold 550W, Fully Modular, EVGA ECO Mode, 5 Year Warranty, Includes Free Power On Self Tester Power Supply 220-GS-0550-V1 EVGA 550 GS - "Silence is Golden" 80 PLUS Gold certified, with 90% (115VAC) / 92% (220VAC~240VAC) efficiency or higher under typical loads Fan Size / Bearing: 120mm Teflon Nano-Steal Bearing 5 Year Warranty and unparalleled EVGA Customer Support Heavyduty protections, including OVP (Over Voltage Protection), UVP (Under Voltage Protection), OPP (Over Power Protection), and SCP (Short Circuit Protection)