Power Supplies: Cooler Master GX 750W

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cooler_master_gx_750wWith the number of variations of motherboard and potential graphic card setups available it is often difficult for the average system builder to decide on the correct power supply for their build, especially for multiple graphic card system setups.  With this in mind Cooler Master have released their latest PSUs the GX (Gamer Xtreme) series which at first glance appears to be able to cater for everyone.

The Cooler Master GX series published features include:

  • Compliance with the latest Intel standard ATX 12V V 2.31
  • Single 12V rail for most demanding SLI configurations
  • High efficiency design that meets 80plus requirements (85% typical)
  • Ultra-silent operation with intelligent 120mm fan speed control
  • Multiple protection design
  • High reliability
  • Huge bulk capacitor for hold time up >17ms at full loading
  • Integrated Active PFC with PWM
  • Efficient transformer
  • Five year warranty


The GX 750W we reviewed came as a fairly simple looking unit, including mounting screws, a manual and a power cable.  The unit itself is housed in a matt black casing with a mesh exhaust vent and a top mounted cooling fan.  As regards connectors the power supply is mainly aimed at high end gaming systems with SLi or CrossFireX configurations and these are supported through four 6+2pin PCI-E connectors.  Motherboard connections are through a  standard 20+4 pin configuration and there is a single +12V 4+4 pin CPU connector.  As regards drives and fans, there are two lines for SATA each including four connectors apiece and a separate line incorporating 3 molex connectors and a floppy connector (which is probably superflous to most gamer these days!).  The power supply has a single 12V rail capable of supporting up to 60A and 720W max output: more than capable of powering mid to high end systems.


Installation into our test rig (based around an Antec 1200 case) was very simple considering it is a full tower, with plenty of length in all cables to reach their destination even allowing for routing to minimise clutter.  Because of the lack of a modular design for the power supply there was a bit of work to hide all extraneous cabling, but this wasn't a great deal (mainly one of the SATA cables that wasn't required).  The limited number of molex cables didn't effect installation and we successfully managed to connect up the copious number of case fans.

As regards testing, OCCT was used to subject the power supply to stress testing and the power supply performed well, although there was a slightly higher than expected fluctuation in the 12V line at "peak" loads.  Despite this reading, we would be surprised to see any current system home build that utilised the full 720W and therefore would not consider this a concern.  Throughout testing the PSU  fan was impressively quiet in comparison to the 120mm fans built into the test rig.

With the number of features, a high power rating (although we probably wouldn't recommend running this or any PSU at full power for any length of time), with a relatively low cost (~£90 at the time of writing) we can't see any reason not to recommend this PSU for anyone wanting to build a mid to high-end gaming system, especially given the reassurance of the industry leading five year warranty.

Available from:

Amazon: COOLER MASTER CM-RS750-ACAAE3-UK GX-Series 750W Power Supply Unit SLI/80 Plus (UK)