Introduction and Features

The XClio 750W power supply was designed for high-end power users and gamers who want a power supply with plenty of power that is reliable, quiet and with above average efficiency.

XClio recently introduced six new power supplies in their GreatPower product line, which range in output capacity from 500 to 750 watts.  These new models all feature a large 140mm cooling fan, modular cables, active PFC, and quiet operation.  In addition, the power supplies come with a special rubber coating designed to provide added shock resistance and help minimize noise. 


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XClio GreatPower 750W Main Features

·         Up to 750 Watts continuous output power

·         Quiet operation

·         140mm cooling fan with intelligent fan speed control

·         Modular cables for peripheral devices

·         Special rubber material coating

·         Quad +12V outputs

·         Serial-ATA drive and PCI-Express connectors

·         2-Year warranty


The XClio 750W power supply was evaluated on 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 we looked at voltage regulation, electrical noise (AC ripple), airflow, sound level, efficiency and cost.  Here is a block diagram of the test bench setup and a list of the equipment I used during testing.



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  • FLUKE 87-III True RMS digital multimeter (Accuracy +/- 0.05% of 3-digit reading)
  • WattsUp? Pro — digital wattmeter and power analyzer (3% of displayed value)
  • Hitachi V-650F 60 MHz dual trace oscilloscope (Accuracy +/- 3% of input range)
  • 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).





The XClio 750W power supply is rated for a combined maximum load of 750 watts.  In addition to the power supply, each package also includes a power cord, mounting screws, printed User’s Manual, and a full set of modular peripheral device cables.  The main 20/24-pin ATX connector, 4-pin Aux 12V connector, and two of the four PCI-E connectors are hard-wired.


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All the new GreatPower power supplies incorporate active power factor correction (PFC) so there is no AC line voltage selector switch on the rear panel.  Each unit has a power cord receptacle and On-Off switch.


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Next Page – A Closer Look

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