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Antec Signature 850W Review

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Environmental Factors:

With 80 PLUS Bronze certification, on which I have a few things to say later, and almost unity power factor, the Antec Signature 850W will play a small part in cutting your energy bills. The Antec Signature 850W complies with RoHS regulations which isn't really unusual these days. Packaging on the Signature could have been better from an environmental point of view, there are alternatives to foam and plastic available, but I have to say it does look the part and perhaps it's a little unkind to compare it with a shoe box.

Price Per the Watt:

Power Supply Antec Signature 850W at $229.99 = $0.27/Watt (September 2008)

A minor disappointment was its failure to comply with its 80 PLUS Bronze certification but the Signature can boast the best efficiency results I have ever seen which will be difficult to better. If you are looking for a power supply to run your two 9800 GX2 graphic cards in SLI, well look no further. I was able to verify its certification by cross-referencing Nvidia's list of certified components.

The AC ripple/noise levels are amongst the best I have seen and enable the Signature to produce DC rails of excellent quality. This is the first power supply I have tested that derives the 3V3 and 5V0 rails via DC to DC regulators and perhaps this can, to some extent, explain the low AC ripple/noise levels.

The cooling fan is bearly audible up to approximately 500W (700 RPM), which is more than enough for the average user. Over 600W and fan speed increases significantly as it heads up toward 850W and 3000 RPM but I think this is inevitable with a cooling fan of only an 80mm diameter.

I would highly recommend the Antec Signature 850W to anyone considering high end graphics cards in SLI or Crossfire but perhaps it's a little expensive and over powered for the majority of users. If price is not an issue and you are looking for a high quality power supply, almost silent up to approximately 500 - 600W, then the Antec Signature 850W will I'm sure, prove to be a wise investment. Despite the failure to meet the claimed 80 Plus Bronze efficiency levels, the efficiency is still very good and I have no hesitation in giving the Antec Signature 850W an OCC Gold Award.



  • Excellent DC voltage regulation
  • Excellent AC ripple/noise levels
  • Efficiency of up to 85%
  • Active PFC
  • Good selection of connectors
  • Quiet operation
  • Five year warranty



  • Failure to meet the 80 Plus Bronze specification
OCC Gold

  1. Introduction & Closer Look
  2. Closer Look (The Power Supply)
  3. Specifications & Features
  4. Testing: Load Testing at 110VAC & 230VAC
  5. Testing: Efficiency & Power Factor
  6. Testing: Temperature, Noise Levels & Fan Speeds
  7. Conclusion
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