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FAN & FAN CONTROL
Nexus' tagline for the NX-9003 is SFB: "Security Fan Backup". Nexus
has gone to some trouble to make sure that people know that the fan is not supposed
to spin under ordinary conditions. The diagram below, from Nexus' web site,
is supposed to show how it works.
The basic idea is clear enough. Neither fan will start until a thermal
threshold is reached. Once the fans turn on, they remain at a constant speed
until the next threshold is reached, when the fan speed jumps up to a faster
There are two fan controllers: One for
the fan in the power supply, and another for two
external fan headers. Each controller has its own thermal sensor. Both fan controllers
are integrated into a PCB separate from the main power supply.
In addition to the usual mess of wires and fan headers, there is also a buzzer
that will produce an audible warning if either of the two sensors gets too hot.
The fan controller has its own PCB, right next to the fan itself.
The thermal sensor for the main cooling fan is on the smaller of the two
The thermal sensor for external fans is on an external lead, and can be placed wherever
the user sees fit. For our testing, we placed the sensor right next to a sensor
of our own so we could track its temperature / voltage relationship.
On top: Our own thermal sensor. The green thermistor below it controls
the external fan headers.
A high speed Yate Loon with sleeve bearings.
The fan is an orange Yate Loon, model
D12SH-12. This is a higher speed version of the Nexus Real Silent
120mm fan. It's rated for about double the airflow. Unfortunately, this is
not a good sign: A faster fan is almost always noisier.
CABLES AND CONNECTORS
The following cables come with the NX-9003. All cables are sleeved in black
mesh except for the fan headers and thermistor, which are sleeved in heatshrink
material. The IDE drive connectors have grips on them to ease removal.
- 19" cable for main 20+4-pin ATX connector
- 19" cable for auxiliary 4-pin 12V AUX connector
- 19" cable for 6-pin PCIe connector
- 31" cable with three SATA drive connectors
- 31" cable with two 4-pin IDE drive connectors and one floppy connector
- 31" cable with three 4-pin IDE drive connectors
- 2 x 20" orange cable with one 3-pin fan header
- 13" cable with the thermistor that controls the two fan headers.
The orange cables are fan headers.
The assortment of cables is extensive enough for most systems, and none of
them are particularly long or short. Only a single PCIe cable is included, as befits the unit's relatively modest output rating.
The fan headers are a little on the short
side. In a standard ATX case, this shouldn't be a problem, since most of the
system fans are right next to the power supply, but it would be hard to
reach a front-mounted fan.
The length of the cable for the thermal sensor may be more of a concern. At
a puny 13", its range of positions is
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