Review Index:

Cooler Master UCP 900W Power Supply Review

Manufacturer: Cooler Master

Introduction and Features

Cooler Master may be best known for their full line of PC enclosures and cooling accessories but they have recently added three new power supplies to their Ultimate Circuit Protection (UCP) series; with output capacities of 700W, 900W and 1,100W.  The UCP-900W power supply unit that we are reviewing today is designed to deliver clean, efficient, and stable power for today’s high-end systems. 

In addition, the CM UCP 900W PSU is certified by NVIDIA (SLI-Ready) and 80 PLUS (Silver) and it won an Innovation Award at Computex 2008.  The UCP 900W power supply features four +12V rails, which Cooler Master claims will provide better power distribution for SLI and two way server applications.  It comes with two 8-pin CPU connectors along with four 6-pin and two 8-pin PCI-E connectors for powering the latest generation of work stations and gaming systems. 

Cooler Master UCP 900W PSU Key Features:

    900 watts continuous power output (1,080W peak)

    DC to DC Voltage Regulator Modules (VRM) offer high efficiency

    Supports latest EPS12V v2.92 and ATX12V v2.3 standards

    High quality Japanese capacitors (solid polymer caps on secondary)

    Quiet operation with intelligent 120mm fan speed control

    Four +12V outputs (up to 852W combined)

    High-Efficiency (88% typical load) with 80 PLUS Silver certification

    All hardwired cables, fully sleeved

    Six PCI-E connectors (four 6-pin and two 8-pin)

    Active PFC with Universal AC line input

    OVP / OCP / OPP / SCP / UVP / OTP protection with fault indicator LED

    5-Year limited warranty 

Establishing an accurate load is critical to testing and evaluating a PC power supply.  PCPerspective’s power supply test bench can place a precise 2,000 watt DC load on the PSU under test.  Each power supply is tested under controlled, real-world conditions up to its maximum rated load (at 40ºC), using both 115 VAC and 240 VAC line voltage.  Our current suite of tests includes:

    DC Load Regulation

    DC Line Regulation

    DC Cross-load (unbalanced load)

    AC Ripple and Noise

    Power Factor


    Differential Temperature


The CM UCP 900W 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. 

    (2) CSI3710A Programmable DC load (+3.3V and +5V ouputs)

    (4) CSI3711A Programmable DC load (+12V1, +12V2, +12V3, and +12V4)

    FLUKE 87-III True RMS digital multimeter (Accuracy ±0.05%)

    Extech 380803 Power Analyzer (Accuracy ±0.5% 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 407738 digital sound level meter (Accuracy ±1.5 dB)

    Custom Lian Li PC60 enclosure to simulate real-world operating conditions

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