Introduction and Features

The Cooler Master iGreen 600W power supply was designed for users who want a high-capacity, environmentally friendly power supply that is stable, reliable, quiet and operates with good efficiently.

The new iGreen Power 600W power supply is Cooler Master’s latest entry into the PC enthusiast power supply market.  Cooler Master designed the iGreen line of power supplies (430W, 500W, and 600W) with reliability, stability, and high efficiency in mind.  The iGreen 600W power supply incorporates double forward switching circuit technology to achieve up to 85% efficiency.  And a single 120mm fan keeps the internal components cool for reliable operation with minimal noise. 


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Cooler Master iGreen Power 600W PSU Key Features:


  • 600 watt continuous, 700 watts maximum power output
  • ATX12V v2.2 and EPS12V V2.91 compliant
  • Silent operation with intelligent fan speed controller
  • Green power design meets Energy Star and Blue Angel requirements
  • Intelligent Circuit Configuration for higher stability and reliability
  • Double Forward Switching Circuitry for high-efficiency (up to 85%)
  • Active PFC with Universal AC line input
  • NVIDIA SLI certified product
  • Sleeved cables for improved cable management 
  • 3-Year warranty


In addition to the power supply the box also includes a power cord, mounting screws, and a multi-language User’s Manual.


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The iGreen 600W power supply was evaluated on both features and performance.  A full range of equipment was used to test the power supply under controlled load conditions.  In addition to measuring the power going in and coming out I looked at voltage regulation, electrical noise (AC ripple), sound level, efficiency and cost.  Here is a list of the equipment used during testing.


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  • FLUKE 87-III True RMS digital multimeter (Accuracy +/- 0.05%)
  • WattsUp? Pro — digital wattmeter (Accuracy 3% of full scale)
  • Hitachi V-650F 60 MHz dual trace oscilloscope (Accuracy +/- 3%)
  • Powerstat Variable Autotransformer, 1.4 KVA, 0-140 VAC
  • FLUKE  52-II digital thermometer (Accuracy +/- 0.3ºC/0.5ºF)
  • Extech Model 407736 digital sound level meter (Accuracy +/- 1.5 dB)
  • AccuLab V1-10kg digital balance (Accuracy +/- 1g)
  • Homemade PSU load tester — selectable loads (up to 470W)
  • Seasonic PSU load tester (up to 137W)


Establishing a controlled load is critical to testing and evaluating a PC power supply.  I built my own power supply load tester using 13 wire-wound, ceramic resistors of various sizes.  This unit can now place up to a 470 watt combined load onto the power supply being tested and includes independent +12V1 and +12V2 loads.  Different combinations of resistors can be switched in or out to select various loads.  In addition to my own load tester, I also used a load tester manufactured by Seasonic (75W and 137W loads).


Next Page – A Closer Look

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