Cooler Master eXtreme Power Series 550W ATX form factor 12V V2.01 Power Supply - (713001630) Output Capacity - 550 Watts Compliance with the newest Intel standard ATX 12V V 2.01 Super silent operation with intelligent fan speed control (&lt; 20dBA) Support dual +12V and+12V outputs for higher power usage Green power design to meet energy star and blue angel requirements