Cold Test Results (Room Ambient Temperature)

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.

Due to the unique thermal design of the Nightjar NJ450-SXL, we had to change our testing methodology quite a bit. As there is no airflow to assess, we placed a sensor on the bottom side of the chassis and measure its surface temperature instead. Note that these thermal results are not directly comparable with those obtained by testing regular air-cooled products.

The SilverStone Nightjar NJ450-SXL easily honors its 80Plus Platinum efficiency certification, significantly surpassing the minimum requirements of 92%/94%/90% efficiency at 20%/50%/100% load respectively (230V AC input). It has an average efficiency of 92.9% across its nominal load range, a relatively high figure even for an 80Plus Platinum certified unit. The efficiency drop when the unit is powered from a 115V AC source is small, reducing its average efficiency across the nominal load range down to 92.5%. Note that the efficiency drop is more severe at higher loads but negligible, or even negative, when the unit is very lightly loaded.

As expected from a well-designed passively cooled device, the surface temperature of its heatsink increases almost linearly and in near-perfect alignment with the unit’s thermal losses. It does reach over 40°C when the power supply is heavily loaded but that is a perfectly safe figure for an advanced PSU. The internal temperatures of the PSU over its primary and secondary side MOSFETs are acceptable, with the primary side getting a little bit hotter than the secondary side.

The SilverStone Nightjar NJ450-SXL SFX PSU Hot Test Results (~45°C Ambient Temperature)
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  • PeachNCream - Thursday, April 4, 2019 - link

    I had no idea what a Nightjar was until I looked it up. I had previously thought it was some gamer l33t or comic book anti-hero silliness, but its an actual type of real world bird. That's actually somewhat classy for a marketing department. Kudos to Silverstone for it (and shame on me for not knowing previously). Reply
  • dromoxen - Tuesday, April 9, 2019 - link

    No mention of price ? gbp/usd/eur ? these are expensive £166 .. I think the review is a coded way of saying that for most* people the benefit of this over a cheaper fan-ned PSU would not be worthwhile esp as the heat gazinter the case. i would be a customer except for that reason, pretty much got everything right , flat modular short black cables, enough to power any modern GPU. super efficient.
    But I reckon they should get into the HDPLEX market for super tiny PSU (DC-DC) those are way too expensive atm. (but more efficient?)
    Reply
  • PhilipSMazza - Tuesday, April 9, 2019 - link


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  • JTBM_real - Tuesday, April 9, 2019 - link

    I have some experience with PC noise.

    Most audible noise is coming from HDDs and high rev fans.

    My approach is to buy a low noise case - I use Cooler Master.

    Install the largest fans the case support.
    Have SSDs only in the PC.
    If you have to have HDDs at least set up your system not to use the HDDs all the time. Put everything you use often to the SSD.
    Get a PSU with large fan and highest efficiency you can afford.
    CPU cooler again with a large fan.
    GPU should went air into the case.

    The low noise case dims all noises from inside. PSU noise is not audible over other sources of noise.

    Keyboard can create a lot of noise too...
    Reply
  • beginning - Saturday, July 13, 2019 - link

    Glad to see a passively cooled PSU being reviewed here. Thank you. Reply

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