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Cooler Master Real Power Pro 1,250W Power Supply Review

Manufacturer: Cooler Master
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Introduction and Features

Cooler Master may be best known for their full line of PC enclosures and cooling accessories but they have recently added six new power supplies to their Real Power Pro series; ranging in output capacity from 550W to 1,250W.  The soon to be released,  top of the line Real Power Pro 1,250W PSU that we are reviewing today is designed to deliver clean, efficient, and stable power for today’s high-end systems. 


In addition to delivering up to 1,250W of continuous power, the CM Real Power Pro 1250W is certified by NVIDIA (SLI-Ready) and the 80 PLUS organization and is backed by Cooler Mater’s 5-year warranty.  The Real Power Pro 1250W features six +12V rails for better power distribution in Quad-SLI and two way server applications.  It comes with six 6-pin and three 8-pin PCI-E connectors for powering up to three of the latest generation video cards. 

Cooler Master Real Power Pro 1,250W PSU Key Features:

•    1,250 watts continuous power output (up to 50°C)

•    Supports EPS12V v2.91 and ATX12V v2.3 standards

•    Six +12V outputs (up to 1,125W combined)

•    Quiet operation with intelligent 135mm fan speed control

•    High-Efficiency (typically > 85%) with 80 PLUS certification

•    Active PFC with Universal AC line input

•    All hardwired cables, fully sleeved

•    Nine PCI-E connectors (six 6-pin and three 8-pin)

•    Black-chrome finish

•    5-Year warranty 

Packaging and Parts


The CM Real Power Pro 1,250W power supply arrived securely packed inside a retail box that highlights the power supplies features and specifications.  In addition to the power supply the box contains a heavy duty 14AWG/3 power cord (rated for 16A), mounting screws, User’s Manual, case badge, and a Cooler Master branded bottle opener (now that’s Cool :)


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

•    Efficiency

•    Differential Temperature

•    Noise


The CM Real Power Pro 1,250W 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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