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Atrix 500T Extreme 650W Review

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Environmental Factors

The use of packaging materials is basic, but adequate and can more likely be explained by budget constraints, rather than a concern for the environment. The power supply is however, according to the packaging, RoHS, EcoSmart and Energy Star compliant. The use of active power factor correction to strengthen the environmentally friendly claims made by the manufacturer, would have been a more welcome addition.

Price Per Watt

Power Supply Atrix 500T at £29.99 = £0.06/W (February 2007)

If you are in the market for a power supply in the 650W range, I certainly could not recommend this one for a high performance system. Like its name suggests (Atrix 500T), 500W is probably a more realistic maximum than the stated 650W. The efficiency and power factor are very poor and the failure of the unit to maintain the 3V3 and 5V0 lines at heavy loads, just reinforces my case. I should also bring to your attention a really irritating noise coming from the unit at high load - a sure sign of a stressed out low-end power supply. I am convinced this unit would fail within a short period of time if constantly loaded above 500W. The casing of the power supply got far warmer than the temperature of the air leaving the enclosure suggested, but with such a poor efficiency of 57.7%, this is not surprising. If you are after a power supply for a P4 system for office and Internet use, this unit may do, but do not put one of these in a high performance dual core system.



  • Quiet during normal operation
  • Supports SATA an PCI-E
  • Sleeved cables



  • Very poor efficiency
  • Lack of active power factor correction
  • Failure of the 3V3 and 5V0 DC lines at high loads
  • Internal power supply transformer buzz at high loads


  1. Introduction & Closer Look
  2. Closer Look (The Power Supply)
  3. Specifications & Features
  4. Testing
  5. Testing (Continued)
  6. Conclusion
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