‘ Cooler Maser MASTERWATT 650 Semi-Fanless Modular 650-watt [MPX-6501-AMAAB] Power Supply Unit 80 PLUS Bronze Certified The 80 PLUS Bronze certification guarantees that MasterWatt delivers an average efficiency of 85%. Durable LDB Bearing Cooler Master 120mm Silencio FP fan combines sealed LDB bearings with quiet fan blades offering a long lifetime of quiet cooling. Semi-Fanless up to 15% Cooler MasterWatt operates at 0dB under 15% load . Experince no computing. Dual Forward and DC-to-DC Circuit Design The Dual Forward and DC-to-DC circuit design offers reliability and stability. This is especially significant in +3.3V and +5V outputs. More Conductive PCI-e Cables The MasterWatt uses 16AWG cables for PCI-e cables. Less resistance and better efficiency,providing you a safer user environment. Specifications: Product Name MasterWatt 650 Product Number MPX-6501-AMAAB Type ATX 12V V2.4 PFC Active PFC Operation Voltage 100-240 Vac Input Voltage 100-240 Vac Input Current 10-5 A Input Frequency 50-60 Hz Dimensions (LxBxH) 140 x 150 x 86 mm Fan Size 120 mm Fan Bearing LDB Power Good Signal 100-500 ms Hold Up Time 16ms at 80% load Efficiency 85% @ Typical Load ErP 2013 Lot 6 Yes MTBF >100,000 hours Operating Temperature 0 ~ 40°C Protections OCP / OVP / UVP / OPP / OTP / SCP Regulatory CCC, CE, TUV-RH, RCM, EAC, cTUVus, FCC, BSMI, KC, CB Connectors MB 24 Pin 1 CPU 12V 4+4 Pin 1 SATA 9 Peripheral 4 Pin 3 FDD Cable 4 Pin 1 PCI-e 6+2 Pin 4 For more : http://www.coolermaster.com/powersupply/80-plus/masterwatt-650/