Cooler Master UCP 900W Power Supply (RS-900-AAAA-A3)

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Cooler Master's UCP (Ultimate Circuit Protection) re-defines the standard for efficient and durable computer power supplies. The UCP 900W takes center-stage as the world's 1st 80 Plus Silver certified high wattage power supply; powering systems with enough juice at 88% efficiency.

Innovative circuitry layout has resulted in industry-leading efficiency levels, thanks to the high performance active clamp switch design, dual-VRM circuit boards for maximized 12V conversion to 5V and 3.3V and re-design of circuit board layout.

The UCP series is meant for powering the high-end system setups; with circuit protection in mind to prolong the life-time of the power supply. Features that enable this includes: soft-start circuitry to limit inrush currents (a Cooler Master unique feature) and the usage of quality components such as solid capacitors and intelligent fan control.

With ever increasing global demand on, it is becoming more important as a power supply provider to offer efficien energy. We are ecstatic to have accomplished this with the introduction of the UCP 900W.

Cooler Master's excellence in design & engineering has resulted in this milestone achievement and has already gained worldwide acclaim, which includes: Tom's Hardware MOST Innovative product out of 1725 exhibitors at Computex 2008.



  • VRM(Voltage Regulation Module) Circuit offers high efficiency and Power density.
  • Compliance with the newest Intel standard ATX 12V V2.3
  • Compliance with the newest SSI standard EPS 12V V2.92
  • Ultra-silent operation with intelligent 120mm fan speed control
  • Eco-design for energy and money saving by Active PFC.(>0.9) / high efficiency(>88%)
  • Power Failure Detector will light up when OVP /OCP / OPP / SCP / UVP /OTP occur
  • Soft-start circuit A protection mechanism that limits the input inrush current by delaying the actual power-on of the PSU to prevent damage to it.
  • Green mode PFC control circuit by intelligent PWM power conversion
  • By using a single 12V switching circuit design you get a more efficient AC to DC conversion which leads to an overall more efficient PSU

Technical Details


  • Brand : Cooler Master
  • Model : RS-900-AAAA-A3
  • Type : ATX 12V V2.3 / SSI EPS 12V V2.92
  • Input Voltage : 90~264V
  • Input Current : 12A@ 115 Vac / 6.3A@ 230 Vac
  • Input Frequency Range : 47 ~ 63 Hz
  • PFC : >0.9
  • Power Good Signal : 100 ~ 500 ms
  • Hold Up Time : > 17 ms
  • Efficiency : >88%
  • MTBF : >100,000 hrs
  • Protection : OVP / OCP / OTP / OPP / SCP / UVP
  • Output Capacity : 900W
  • Max. Output Capacity : 1080W
  • Regulatory : NEMKO / TUV / CE / GOST / C-tick / UL / FCC
  • Fan : 120mm Fan
  • Certification : SLI / 80 Plus
  • Dimensions : 150 x 190 x 86 (mm)


  • M/B 24 Pin Connector x 1
  • CPU 4+4 Pin x 2
  • PCI-E 8 Pin x2
  • PCI-E 6 Pin x4
  • Peripheral x 5
  • SATA x 9
  • Floppy x 1



Brand  Cooler Master
Model  RS-900-AAAA-A3
Series  UCP
Type  ATX 12V V2.3 / SSI EPS 12V V2.92
Maximum Power  900W
Fans  120mm fan
PFC  Active
+12V Rails  2
PCI-E Connectors  4 x 6Pin, 2 x 8Pin
Power Good Signal  100-500ms
Hold-up Time  17ms min.
Efficiency  88%
Energy-Efficient  80 PLUS Certified
Input Voltage  90-264VAC
Input Frequency Range  47 ~ 63Hz
Input Current  12A @ 115Vac / 6.3A @ 230Vac
Approvals  Nemko / TUV / UL / CE / BSMI / FCC / GOST / C-tick
Dimensions  150 x 190 x 86mm


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