One notably annoying disadvantage of almost all highly effective electronics is the noise generated from their required coolers. Though PC elements are getting increasingly environment friendly, the final rule nonetheless holds: a robust PC will include vital cooling necessities.

This sometimes isn’t a priority for avid gamers, because the noise generated by the PC is commonly overshadowed by the audio system or headphones. For customers who need to construct a high-performance leisure heart, nevertheless, noise generally is a vital subject. When a PC is put in in the lounge, it must be highly effective sufficient for video games, however nonetheless quiet whereas enjoying/streaming media. The identical goes for customers who mix their skilled and gaming wants into one system or, for no matter purpose, they require plentiful processing energy to carry out their career.

One of many main noise sources inside a PC is the ability provide unit (PSU). Low-cost PSUs are usually much less environment friendly – dropping a bigger portion of their enter energy to waste warmth – and because of this they depend on a robust move of air slightly than heatsink floor space alone as a way to dissipate warmth, which makes them fairly loud when energy necessities are excessive. Fortunately, enhancements in PSU effectivity have been driving down the quantity of waste warmth (and thus noise) over time – at the very least for the higher-end fashions. Because of this, what we frequently discover is that the upper high quality (larger priced) a PSU is, the quieter it operates.

In at present’s overview, we’re taking a look at a PSU from SilverStone that places that rule to the check: the Nightjar NJ700, a 700 Watt ATX PSU that’s so environment friendly and well-designed in order to require no energetic air cooling in any respect. Though passively cooled PSU are as uncommon as hen’s tooth, now we have seen a number of passively cooled PSUs up to now, together with our latest overview of SilverStone’s personal Nightjar NJ450-SXL. The distinctive side of the Nightjar NJ700 is the excessive energy output of 700 Watts, which requires an amazingly environment friendly design to have the ability to deal with the thermal losses with none energetic cooling.

Energy specs ( Rated @ 50 °C )
AC INPUT 100 – 240 VAC, 50 – 60 Hz
RAIL +3.3V +5V +12V +5Vsb -12V
MAX OUTPUT 20A 20A 58A 2.5A 0.3A
100W 696W 12.5W 3.6W


Packaging and Bundle

We acquired the SilverStone NJ700 in an aesthetically easy however sensible cardboard field. The art work is simplistic, with a blue/gold coloration theme and based mostly round an image of the PSU itself. However, the field is sizable and with very thick exterior partitions, offering ample transport safety.

SilverStone normally goes with the naked minimal variety of bundled objects, however the NJ700 appears to be an exception. Contained in the field, we discover the mounting screws, the required AC energy cable, an intensive guide, quite a few cable ties, and 5 high-quality black/white cable straps.

The SilverStone Nightjar NJ700 is a totally modular PSU and each cable, together with the 24-pin ATX cable, could be indifferent. Except the 24-pin ATX cable, the remainder of the cables are ribbon-like, “flat” kind. The primary 24-pin ATX cable is fabricated from all-black wires too however they’re bundled and held inside a black nylon sleeve.

SilverStone Nightjar NJ700
Connector kind Hardwired Modular
ATX 24 Pin 1
EPS 4+4 Pin 1
EPS 8 Pin
PCI-E 6+2 Pin 4
PCI-E 8 Pin
Molex 6
Floppy 1

The SilverStone Nightjar NJ700 PSU

Exterior Look

The SilverStone Nightjar NJ700 positively is an irregular design, with all surfaces besides its backside perforated to permit for the utmost doable passive airflow. The perforation sample alone is sufficient to trace the OEM behind this PSU’s creation to a seasoned skilled.


Its chassis is dimensionally near that of an ATX unit however the NJ700 is 170 mm lengthy, making it a bit longer than what the ATX commonplace dictates. Nonetheless, there shouldn’t be any clearance points with any however probably the most restrictive of PC instances. On account of its thermal design, nevertheless, we might not suggest putting in it inside a case with a decent PSU cowl as a result of it might basically block any warmth switch from the unit. The NJ700 is designed in order to be put in with the vents dealing with upwards, letting the recent air rise and in the end exit the case through different followers or vents.

As a way to go away the heatsinks unobstructed, the designer moved the sticker with the unit’s electrical specs and certifications to the underside aspect of the unit. Even there, the sticker was restricted to lower than half the floor space, as small vents have been positioned beneath important elements.


On the rear aspect of the PSU, we discover the standard on/off change and the AC cable receptacle. The fascinating factor right here is that SilverStone’s engineers positioned two mounting gap patterns, permitting the mounting of the PSU to face upwards or downwards. Relying on the case that the PSU shall be put in in, the person has to make an informed guess as a way to verify the optimum orientation for efficient passive air cooling. The entrance aspect hosts the connectors for the modular cables, all of that are black however are keyed and it’s not doable to mix-up the connectors whereas attaching the cables. A fundamental legend is sprayed straight on the PSU’s chassis.

Inside Design

With no fan to speak about contained in the SilverStone NJ700, we soar instantly to the OEM of the platform, who’s none aside from SeaSonic. As we talked about above, that is apparent to an skilled PC builder, because the exterior design of the PSU is, except for the corporate’s logos, virtually similar to that of the SeaSonic Prime Fanless. SilverStone normally employs Improve for his or her fanless PSUs however, apparently, Improve doesn’t but have a platform that may ship this excessive an influence output with none energetic cooling.


As anticipated from SeaSonic and for the character of this specific design, the platform that the NJ700 relies upon is just about one of the best it may probably be with out using cutting-edge digital electronics. That their engineers managed to squeeze 80Plus Titanium effectivity ranges out of an analog design is kind of a feat by itself. SeaSonic most likely sticks with such designs as a result of their extraordinarily excessive reliability and confirmed monitor report from a long time of use.

The insides of the SilverStone Nightjar NJ700 don’t look a lot totally different than another prime quality 700W PSU. Even the heatsinks, although sizable, should not as substantial as one would anticipate from a passively cooled unit. Solely the heatsink positioned straight on the principle transformer stands out in comparison with typical ATX merchandise.

A beneficiant filtering stage begins behind the AC receptacle, beneath a protect, with six Y capacitors, three X capacitors, and two filtering coils. There are two highly effective rectifying bridges, with a large heatsink sandwiched in between them. There are two APFC capacitors, each made by Nippon Chemi-Con and rated at 400v/470μF every.

The first aspect of the PSU is a normal full-bridge configuration with an LLC resonant converter. On the secondary aspect, 4 MOSFETs generate a single 12V line, with extra DC-DC converters current to generate the 5V and three.3V strains from that. The distinction is that each the 4 inverting transistors on the first aspect and the 4 changing MOSFETs on the secondary aspect are top-tier merchandise with extraordinarily low drain-source resistance and gate cost, making them remarkably environment friendly.

Many of the secondary capacitors within the SilverStone NJ700 are polymer merchandise made by FPCAP. Numerous them are positioned on the secondary PCB that holds the connectors for the ability cables for the ultimate filtering of the DC energy strains. Nonetheless, there are just a few electrolytic capacitors current, one made by Rubycon and the remainder by Nippon Chemi-Con, making the Nightjar NJ700 an all-Japanese affair.


Please enter your comment!
Please enter your name here