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Ultra LSX 750W Power Supply Review




Price Per the Watt:

Power Supply Ultra LSX 750W at $139.99 = $0.19/Watt (11-2010)


Let's first take a look at what I don't like about the Ultra LSX 750W power supply. If Ultra is really serious about producing power supplies for the enthusiast market then it has to stop rating them at a working temperature of 25 °C — 40 °C~50 °C is more realistic. This temperature is of course dependent on the quality of the case cooling, but if a power supply is rated at only 25 °C and reaches a working temperature of 40 °C or more, it will have an impact on its performance. The degree of the impact I am at present unable to measure, but efficiency and DC quality will be degraded to some extent. I don't like to see PCI-E connectors daisy chained on a single cable set because there is always the possibility that one cable with a 6-pin and 8-pin PCI-E connector will be used for a single high end, power hungry graphics card. It's not a configuration you will see on other high end power supplies and may lead to excessive voltage drops.

It's strange that there isn't a feature list on the power supply packaging or in the accompanying literature because it's a very good way of getting across the main points and I'm sure it's the first thing many prospective buyers look for on a product. The manual contains most of the information required by the average user and contains an excellent power supply fitting guide for the novice builder, including photographs.

If I'm being honest, the Ultra LSX 750W power supply performed beyond my expectations. I know from past experience that other Ultra power supplies haven't quite been up there with the best, but the LSX 750W electrical performance is excellent. The DC voltage load regulation, in combination with very low noise/ripple levels, make for very good DC quality on all the rails. The efficiency, though not quite meeting its 80 Plus Bronze certification following the OCC power supply testing methodology, is still very good at 87% maximum. I don't like the PCI-E wiring configuration and the rated working temperature of only 25 °C, but the Ultra LSX 750W power supply produces stable, good quality DC rails. It's a little on the expensive side and there are other 750W power supplies available that are just as good for less money, but you do get a limited lifetime warranty. Despite one or two minor gripes, I have no hesitation in awarding the Ultra LSX 750W power supply the OCC Silver award.



  • Voltage regulation
  • DC quality
  • 80 Plus Bronze
  • Limited lifetime warranty (with registration)
  • Plenty of connectors
  • Great set of accessories



  • Rating at 25 °C
  • PCI-E connector/cable configuration
OCC Silver

  1. Introduction & Closer Look
  2. Closer Look (The Power Supply)
  3. Specification & Features
  4. Testing: DC Voltage Load Regulation
  5. Testing: Efficiency, Power Factor & DC Quality
  6. Testing: Temperature, Noise Level & Fan Speed
  7. Conclusion
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