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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 2 of 3
Opening up the unit reveals a couple decent sized capacitors but relatively puny heatsinks. Their size (as well as that of every other component) is no doubt limited by the thickness of the fan which spans most of the top. Speaking of which, it's a 120x25mm blower (model name D12SM-12) made by Yate Loon Electronics and rated at 12V, 0.3A, and 1650RPM providing 56CFM at 39dBA. By default the fan runs at a fraction of its voltage, referred to by Nexus as its "idle mode". At this level it's rated at 16.2dBA which is inaudible beyond a couple inches. It speeds up in a linear fashion as the temperature rises (and increases in noise as well as airflow), though having used it for almost a week now I haven't witnessed any apparent changes in airflow.
Testing was done using a PSU loader which demands 138watts from any connected power supply. The readings were taken using Seasonic's PowerAngel power monitor. I also used an actual low-mid range system (by enthusiast standards anyhow) and recorded the results using Motherboard Monitor 5.3.7. The system specs are as follows:
- AXP 1700+ JIUHB DLT3C 1.5v (11x133 = 1466mhz) @ 11x166 (1833mhz) 1.5v
- Biostar M7NCG nForce2 motherboard
- 2x256mb PC3200 Crucial DDR400
- Gainward GeForce3 Ti200
- Onboard audio and LAN
- Western Digital 1000JB SE 100GB HDD
- 16x Lite-On DVD drive
- 12x10x32 Plextor CD-RW drive
- Mitsumi FDD
- 2x 12" blue CCFLs
- 4x 80mm fans
- 1x 60mm fan
Surprisingly my test rig used up less power than the PSU loader (only 77% as much as the loader actually). There were four sets of readings taken, two from the loader and two from the system, one during idle mode and one during load for both setups. "Idle PC" is my system sitting in WinXP doing its thing. "Load PC" is me hacking away at Doom 3 Hell Knights. "Idle Force" was achieved by running the power supply without anything connected to it using the wire trick. "Load Force" represents the values returned while when hooking up the PSU to the loader. The results are as follows.
First up are the voltages. The readings are pretty stable up to about 140watts at which point it drops to 117 at the 180watt mark.
While idling my system required surprisingly little current; less than 5 times the amount of the PSU not connected to anything. Obviously with increased load the readings also rise. Keep in mind that multiplying volts by amps in these graphs will not give you the same wattage reported in the next graph because these readings are instantaneous and are the highest ones recorded in their category; they're not averages but rather approximations so they don't necessarily correspond to each other.
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Last Updated ( Monday, 18 June 2007 )
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