Cooler Master Elite V2 - 550W Long-Lasting Power Supply with Full Electrical Protection (OVP/UVP/OPP/OCP/SCP) Compliance with the Intel standard ATX 12V V2.3 More than 70% efficiency at typical load operation High performance components design for better reliability Green power design to meet Energy Star and Blue Angel requirements Multiple protection design (OVP/OCP/OPP/SCP) Support dual +12V1 and +12V2 outputs for higher power usage &gt;75% efficiency at typical load operation One 4+4 pin +12V CPU connector for high-end CPU support 120mm quiet fan with intelligent fan speed controller Compliance with Intel ATX12V V2.3 Full protection design (OVP/UVP/OPP/OCP/SCP)