Atom B550 utilizes active PFC, and provides efficiency during max and low loads—living up to the performance standards that we are known for.80 PLUS® BRONZE Certified - To reduce your electricity bill.CircuitShield™ - Industrial grade protections: OPP/OVP/UVP/SCP120mm Silent FanFLAT CableThermal Manager - An advanced fan control for optimal heat & noise management.Active Power Factor Correction (APFC)3-Year Warranty