Cold Test Results

For the testing of PSUs, we are using high precision electronic loads with a maximum power draw of 2700 Watts, a Rigol DS5042M  40 MHz oscilloscope, an Extech 380803 power analyzer, two high precision UNI-T UT-325 digital thermometers, an Extech HD600 SPL meter, a self-designed hotbox and various other bits and parts. For a thorough explanation of our testing methodology and more details on our equipment, please refer to our How We Test PSUs - 2014 Pipeline post.

Since this power supply is fanless, we are going to have two fewer graphs in this review. The first one is the noise chart, as this product has no moving parts and thus does not generate any noise, and the second one is the air temperature chart, as this method cannot be accurately applied if there is no forced airflow.

The electrical performance of the Nightjar NJ520 is excellent, which was to be expected from a Seasonic design. At room temperature, the Nightjar NJ520 easily meets the 80Plus Platinum certification and displays an average energy conversion efficiency within the nominal load range (20% to 100%) of 93.0%. Loads lower than 50 Watts however have a significant impact on the efficiency, which drops below 80%. This does not affect the 80Plus certification, which takes into account only the 20% to 100% nominal capacity range.

Even though it is a very efficient model, the Nightjar NJ520 remains surprisingly cool for a passive power supply, with the temperature of the primary and secondary heatsinks reaching up to 56.4 °C and 57.0 °C respectively. Although these figures are relatively high for a 520 Watt model in room temperature, the Nightjar has no forced cooling and therefore it is perfectly natural for it to be warmer than typical units.

The SilverStone Nightjar NJ520 PSU Hot Test Results
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  • A5 - Tuesday, July 8, 2014 - link

    An easier solution for a network-appliance kind of box is to just physically store it somewhere you can't hear it...
  • mapesdhs - Tuesday, July 8, 2014 - link

    For various reasons I didn't want to or couldn't do that.

  • basroil - Tuesday, July 8, 2014 - link

    A good case will do wonders for noise control, and often the PSU makes less noise than HDDs under normal use. And if you use a normal CPU/GPU cooler, either one makes far more noise than the PSU will ever get to.
  • mapesdhs - Wednesday, July 9, 2014 - link

    I used a very good case, fanless excellent PSU, on-chip gfx, and an Akasa cooler
    marketed as being quiet and (oddly enough) it indeed was. Silence. 8)

  • viharm - Wednesday, September 4, 2019 - link

    Excellent comment with very good information. Thanks @mapesdhs
  • HardwareDufus - Tuesday, July 8, 2014 - link

    Two thoughts: 1. something I might use on a long road trip, when it's the middle of the night and there are no discreet highway turnoffs. 2. single-function chamber pot

    Then I remembered the bird.

    Anyway... that's some difficult branding to get your mind around.
  • romrunning - Tuesday, July 8, 2014 - link

    What? It's a bird?! :)
  • romrunning - Tuesday, July 8, 2014 - link

    "Are you tired of reading reviews of high output power supply units? "

    Yes! A thousand times yes! 90%, maybe even 95%, are NOT running dual GTX Titans or some other power-hungry setup that would require a 1000W+ P/S.

    I want to hear about decent SFX power supplies or even small modular P/S that will support a single video card & a couple of drives. That's all most people are running. As video cards get more power efficient (look at Nvidia's Maxwell), lower rated P/S can become more efficient as well. So point out the good ones that are less than 500W. The more reviews you get, the better quality the vendors will have to make as their faults and cost-cutting measures will be on display to everyone.
  • HardwareDufus - Tuesday, July 8, 2014 - link

    "I want to hear about decent SFX power supplies or even small modular P/S that will support a single video card & a couple of drives. That's all most people are running."

    I agree whole heartedly with your sentiments!! I did purchase a Silverstone SFX 450 for my miniITX machine. Still more watts and connections than I need. (could probably do with 100 really).
  • DanNeely - Tuesday, July 8, 2014 - link

    Same here. Power supply company review liaisons, are you reading this?

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