Silverstone has expanded their Nightjar family of power supplies with the addition of a new SFX-L class sized silent PSU, the NJ450-SXL. The new PSU, according to Silverstone, is the first ever fanless SFX-L design. The 450W PSU is said to use premium components, achieves an 80 Plus Platinum level of efficiency, and can output nearly 38A on the +12V rail, all in a fanless 0 dBA aluminum chassis measuring in at 5.12” x 2.5” x 4.92” (WxHxD).

The black chassis is made out of an extruded aluminum shell with fins running front to back on all four panels, serving as a heatsink to remove heat away from the internal components. The other faces of the PSU contain the connectors for outputs and the power plug & on/off switch respectively. The unit does not appear to be vented so the integrated heatsink/chassis will have to do all the work getting the heat out of the device. That said, it is rated to deliver 100% load 24/7 while operating up to 40C.

The Nightjar NJ450-SXL is 100% modular using short flat cables which can make for an easier attempt at hiding the wires. Outside of the 4-pin EPS and four 6/8-pin PCIe connectors measuring in at 400mm/~15-inches, the rest of the cables are 300mm/11.8-inches in length so these may not reach in the largest of cases. Additionally, the NJ450-XSL includes eight SATA connectors, three 4-pin Molex connectors, and a 4-pin legacy floppy connector (100mm length). The power supply can support a single high-end video card or multiple mid-range cards with its connections.

The output on the all-important 12V rail is 37.5A/450W, which is enough to handle many systems, especially HTPC or SFF systems that may not need as much horsepower as other systems. Silverstone has a published GPU support list stating users shouldn’t have an issue powering a PC using even top-of-the-line cards like an NVIDIA GeForce GTX 1080 Ti or AMD Vega 64. 

A warranty period isn’t currently listed for the NJ450-XSL but its older cousin, the NJ520 is warranted for three years. The official product page does not provide pricing or availability information. Due to the nature of the unit itself, an 80 Plus platinum SFX-L form factor power supply, it will likely fetch a premium. 

Power Specifications of the Silverstone NJ450-XSL 450W
(Rated @ 450W, 40°C)
AC INPUT 90 - 264 VAC, 47 - 63 Hz
RAIL +3.3V +5V +12V +5Vsb -12V
MAX OUTPUT 16A 15A 37.5A 2.5A 0.3A
80W 450W 12.5W 3.6W
Connectors 1 x 24/20-pin motherboard connector (300mm)
1 x 8/4-pin EPS/ATX12V connector (400mm)
4 x 8/6-pin PCIe connector (400/150mm x2)
8 x SATA connector (2 x 300/200/100/100mm)
3 x 4-pin Molex connector (300/200/200mm)
1 x 4-pin Floppy connector (100mm)
Protections Over Current
Over Power
Over Voltage
Short Circuit
Form Factor SFX-L 5.12" x 2.5 x 4.92" (WxHxD)
Cooling System Fanless thermal solution
MTBF 100,000 hours

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  • close - Thursday, June 28, 2018 - link

    Because air has problems "passing through" a completely closed PSU? I'll give you a moment to really think about it.

    An open PSU would allow most of that heat to be dumped directly outside of the PC. A closed PSU will dump the heat inside the PC only to then push it out again. This is for small builds so imagine a more cramped case than your regular ATX build possibly but containing more or less the same components (400W worth of them).

    And that's not even mentioning a passive build. If you're looking for a passive PSU you might be interested in using a minimum of fans, if any.
  • cbm80 - Friday, June 29, 2018 - link

    Usually fanless builds use an external power brick. So again, the airflow through an open PSU isn't "free". Your case fans are doing the work. The same work which is needed for a closed PSU, only through different holes in the case.
  • close - Saturday, June 30, 2018 - link

    You really like dancing around the point.

    No, fanless builds use fanless components, whatever they may be. And look, a fanless PSU. Fully closed, thus not allowing the heat to escape directly outside but rather forcing it first inside a cramped computer case and raising the internal temperature. Whether or not you have fans becomes irrelevant, they will still circulate air at higher temperature inside the case. And your PSU will never be in the flow of air since 3 sides would most likely be covered.

    Did you seal your PC case, put it in the corner of the room, and relied on the draft between the window and the door to cool it? Because it sounds to me like you're saying that a fully enclosed heat source is cooled better by airflow barely touching the outer case than by venting the case and allowing airflow directly over that heat source.
    I Why do you think CLC radiators don't just blow the heat inside the case? Or why so many small builds (especially OEM ones) use ducts to guide the air over the radiators and then out of the case. It's because you can take advantage of physics to improve the cooling.

    Sometimes companies choose the "aesthetic" route (see Antec's recent stuff), choosing form over function. And of course those radiators will needlessly inflate the price of the PSU.
  • cbm80 - Saturday, June 30, 2018 - link

    I never said the PSU would be better (or as well) cooled. I was disagreeing with the statement that a closed PSU would increase temps in general. It won't because less airflow through the PSU means more airflow elsewhere.
  • close - Tuesday, July 3, 2018 - link

    Why less airflow? The airflow just goes over another heat source before exiting the case, you don't have to split it. Instead you are waiting for the PSU to dump the heat next to every other hot component an impede the cooling, then take out that heat with the case fans.

    And that's if you have fans. For a fanless build this makes even less sense.

    This is for the sake of design, not efficiency.
  • dave_the_nerd - Tuesday, June 26, 2018 - link

    There was buzz about this thing even last year - why is it taking so long? :-P
  • milkywayer - Tuesday, June 26, 2018 - link

    Science is hard.
  • meacupla - Tuesday, June 26, 2018 - link

    this looks interesting, but don't the majority of mITX cases rely on the PSU fan to carry some of the heat away?
    Silverstone's lineup especially
  • AdrianB1 - Tuesday, June 26, 2018 - link

    It will be interesting to see affordable high-efficiency PSU's. People talk about global warming, but don't care about PSU's that eat up 20-25% of the electricity their computers consume, unless they want to pay a significant premium to cut that to half.
  • dromoxen - Wednesday, June 27, 2018 - link

    A decent supply of pico-psu could do a great job for efficiency if the power Bricks could be 99% efficient (ac-dc). Never really get any ratings from them eg bronze silver gold .. what is the highest rating anyway ?
    Sadly altho this PSU is great it will be priced far out of reach $150+ (=£150+) better to have a v good quality fan (noctua?) in the psu and a MUCH lower price

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