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Nexus NX-4090 400watt PSU |
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Written by Mikhail Ivanenkov
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Monday, 18 June 2007 |
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Page 1 of 3

Thanks to EndPCNoise for the product sample.
With the current state of the market picking out a power supply is like picking out a video card; too many options and no single clear choice. Not long ago there was a high demand for bigger and better cooling methods at the cost of noise, all in the name of overclocking. Once the majority of enthusiasts satisfied their hunger for multi-GHz systems they quickly realized their screaming fast computers were literally screaming, so a new trend evolved: the quiet PC. There are countless ways of building a such a box, from sound dampening to liquid cooling to cases acting like giant heatsinks (Zalman's TNN 500A comes to mind) and we're here to evaluate one such component: a "silent" PSU.

Nexus, like so many other companies is new to the PSU market. They may not be an Antec or an Enermax, but their expanding product line is full of innovations. Although power supplies do come in fanless form, these have much lower wattage ratings (250-300 vs. 500+) than conventional PSUs and they tend to heat up significantly. The solution as presented by Nexus is a power supply giving the user the best of both worlds: mid-range power rating with a giant low-speed (initially) nearly inaudible fan.
The NX-4090 400watter comes in a nice retail cube box with a handle. Inside you'll find the supply and a power cord, though no screws for installation. The unit is fairly heavy as far as PSUs go (generally a good indicator of quality components). It's painted black and has only one fan: a 120mm bright orange blower undoubtedly inspired by the Thermaltake of old. The blowhole serves as the only major intake for the PSU. The grill is secured underneath the top plate which is good news if you're trying to insert the PSU from the rear of a case with limited clearance.
The majority of the rear is comprised of a honeycomb vent; this design is sturdier than typical circular vents and Nexus claims it to be more airflow efficient. Also around back is the plug, on/off switch and 115v/230v switch. The NX-4090 casing is held together by 4 screws up top and a fifth one on the side; there's no "void warranty if removed" sticker covering the two halves so if you're feeling adventurous have at it (just don't blame us if you fry yourself).

There are just enough connectors present for a general system (splitters can do the rest). You get 4 x 4pin molex plugs, a floppy connector, two SATA connectors (finally!), a 12V plug for use on Intel boards, and the typical ATX. The PSU is also ATX2.0 compatible, but you'll have to buy a separate 24-pin adapter. Given the price (about $110) I would have expected at least some form of cable sleeving or Velcro strips like those found on Zalman's ZM400A-APF. There are a few zip ties here and there, but the majority is still bare and gets tangled; besides, some black mesh would add class to the model.

Instead of dedicated voltage rails Nexus went for a more conventional approach. This limits the total power on the 3.3V and 5V lines to no more than 150watts and the total max output is capped at 385watts. I'm assuming the 400watt label is a marketing gimmick. There are also a couple other conditions: if the 3.3V line is loaded to 30A the 5V line can have no more than 10A and if the 3.3V line is at 3A the 5V can get no more than 28A; this shouldn't be a problem for most users.
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Last Updated ( Monday, 18 June 2007 )
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