The MWE Bronze offers 80 Plus Bronze certification, guaranteeing an average efficiency of 85% at typical load. The DC-to-DC + LLC circuit design allows the unit to convert power to components reliably, efficiently, and safely for better overall performance. This unit operates in silent mode during low load functions and while in standby mode. Not only does this waste less power but it also creates a quieter overall user experience bynot running the fan at maximum noise level when unneeded for safe operation. Discrete flat, black cables give users the ability to manage cabling easily with minimal space lost MWE 600 BRONZE - V2 80 PLUS BRONZE CERTIFIED POWER SUPPLY DC-to-DC Technology 120mm HDB Fan Silent Mode 80 PLUS Bronze Efficiency Flat, Black Cables 5 Year Warranty