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Ultra X4 600W Power Supply Review




Price Per the Watt:

Power Supply Ultra X4 600W at $115.00 = $0.19/Watt (01-2010)


The Ultra X4 600W power supply performed well in some areas, but performed poorly in others. The DC voltage load regulation is on a par with many high end power supplies but the noise/ripple levels are in excess of the limits laid down by the ATX12V V2.2 specification which makes this power supply hard to recommend to the overclocking community. The failure to meet its claimed 80 Plus certification following the OCC testing methodology, excessive noise/ripple on the main DC rails, and lack of technical information make this power supply more suitable for the mainstream market.

The lack of a feature list is very unusual because it's probably the first thing any informed computer enthusiast needs to quickly ascertain its suitability for the next build or upgrade. If Ultra Products are aiming for the high end enthusiast market then improvements are needed if it is going to compete with the likes of Corsair, PC Power & Cooling and Thermaltake.

I have no doubt that the overall performance of the Ultra X4 600W is better than most low/mid range power supplies on the market today, making it perfectly capable of supplying reliable and stable power to any high end, single graphic card, gaming machine. The noise/ripple levels are higher than the ATX12V V2.2 specification allows but in combination with good quality components it shouldn't prove to be a problem. Combine this with a limited life warranty and it's still worthy of consideration but there are far better power supplies, with superior performance, available in this price/power bracket.



  • Good DC load voltage regulation
  • Standard three year warranty upgradeable to limited lifetime if registered online
  • Modular
  • Accessories



  • Excessive noise/ripple on all but the -12V rail
  • Failure to meet its claimed 80 Plus certification following the OCC testing methodology
  • MTBF of 100,00 hours quoted at 25°C


  1. Introduction & Closer Look
  2. Closer Look (The Power Supply)
  3. Specification & Features
  4. Testing: DC Voltage Load Regulation At 110VAC & 230VAC
  5. Testing: Efficiency, Power Factor & DC Quality
  6. Testing: Temperature, Noise Level & Fan Speed
  7. Conclusion
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