Efficiency

07:00 - Monday 11 July 2005 by Frank Völkel
Source: Tom's Hardware – Keywords: stress, test

Table of content:
28 – Efficiency
  1. 1 – Profits Or Quality?
  2. 2 – Still An Eldorado? 600 Percent Profit Margin Possible
  3. 3 – Our Motivation - Why Are We Running PSUs Constantly Under Full Load?
  4. 4 – Test Methodology
  5. 5 – Stressing With Highly Accurate Electronic Loads
  6. 6 – Noise Level And Measurement Of Temperatures
  7. 7 – Data Collection And Live Upload
  8. 8 – AcBel ATX-550CA -AB8FM: Failure - But 10-Year Warranty
  9. 9 – Antec Phantom 500: Quiet With High Efficiency
  10. 10 – Antec True Power 2.0: Mediocre Efficiency
  11. 11 – Aopen Prima Power 700: Super Results - No SLI
  12. 12 – BeQuiet BQT B5-520W-S1.3: Loose Transistor Triggers Failure
  13. 13 – Cooler Master Real Power RS-550-ACLY: Shutdown At Full Load
  14. 14 – Enermax Coolergiant EG485AX-VHB(W): Flawed Former Champ
  15. 15 – Enermax Noisetaker EG701AX-VE(W): Perfect Connections And Quiet
  16. 16 – Epower Silent Engine Xscale 470: Loud At Full Load
  17. 17 – Fortron FSP300-60GNF: Soundless With High Efficiency
  18. 18 – HEC AcePower ACE580UB: Failure At High Load
  19. 19 – Hiper Type R580: Not Within Specifications
  20. 20 – Jeantech Arctic JN120F-600AP12V2: Average Results
  21. 21 – OCZ PowerStream 600W - Features
  22. 22 – PC Power & Cooling Turbo-Cool 510: Very Loud At Full Load
  23. 23 – PC Power & Cooling Turbo-Cool 850 SSI: Excellent Price And Performance
  24. 24 – Seasonic S12 600: Efficient And Quiet
  25. 25 – Silverstone ST65ZF: Loud And Inefficient But Low-Cost
  26. 26 – Spire SP-500W: High Noise Levels At Full Load
  27. 27 – Features Tables
  28. 28 – Efficiency
  29. 29 – Load - Total Power Sustained
  30. 30 – Ripple On 3.3V Rail

Efficiency

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A PSU always draws more power out of the socket in your home than it provides to the PC System. The difference is dissipation or heat. To give you an example - when the PC Power & Cooling PSU provides 850 watts to the PC system it needs 1058 watts from your mains. The efficiency is the ratio between Power IN and OUT. Aopen scores best with 84 percent while Antec still has some room for improvement.

Power Factor Correction

The power factor shows how much your PSU distorts the power drawn from the mains. This kind of displacement is also known as the Cosine of phi. Ideally it would be 1.00 (no displacement or distortion) but none of the PSU is able to manage that. Enermax achieves top values here. Fortron, however, is not very convincing. But bear in mind that Fortron is the only PSU in this roundup that is completely silent due to passive cooling.


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