Nexus NX-4000 400W ATX Power Supply

Company: Nexus
Product: NX-4000 400 Watt ATX PSU
Street Price: ~$110 USD
Date Reviewed: April 17, 2003
Reviewed By: Joey C. aka Chong345
Rating: (8.7/10)

Introduction:

Quiet computers are harder and harder to find as speeds get faster and parts get hotter. To keep systems cool, most users add more cooling fans, increasing the noise level. Nexus Technology has not been around for that long but they have already made an impact on the market for designing quiet computing solutions. They have a line of cases, power supplies, CPU coolers, ram sinks, and many other accessories to help keep computers almost silent while maintaining quality and performance.

Today we get a chance to look at the Nexus NX-4000 power supply. Nexus has designed this power supply to be silent but not at the cost of performance. The power supply runs at 21.7 dB in an idle state. As we all know, heat shortens the life of components, so will the quieter fan be able to keep the power supply cool?

Features and Specifications:

  • Real silent power supply, only 21.7 dB(A) in idle mode
  • High efficiency
  • Output over voltage protection
  • Short circuit protection on all output
  • Reset Table power shut down
  • Approved by: TÜV, CSA, UL, NEMKO, FCC, CB & CE
  • Internal 80mm fan with wiregrill
  • 100% burn-in under high ambient temperature (50oC)
  • Vacuum-impregnated transformer
  • MTBF: 100K hours at 25oC
  • 100% Hi-pot tested
  • Line input fuse protection
  • Active PFC
  • Complies with EN61000-3-2
  • AC input full range

  • Remote ON/OFF Control: The power supply shall accept a logic open collector level which will disable / enable all out put voltage (excluding +5V standby)
  • Temperature range:
    o operating 0oC~50oC
    o storage -20oC~+80oC
  • Temperature coefficient: 0.01% / oC
  • Transient response: output voltage recovers in less than 1ms max. following a 25% load change
  • Hold-up time: 17 ms minimum at full load & nominal input voltage
  • Dielectric withstand: input / output 1800VAC for 1 second, input to frame ground 1800 for 1 second
  • Humidity: 5~95% RH
  • Efficiency: 65% min. 70% typical, at full load
  • Power factor correction: > 0.96 at full load
  • Power good signal: turn-on delay 100ms to 500ms
  • Overload protection: 150% max.
  • Inrush current: 80A cold, 120A warm at 132 VAC
  • Over voltage protection:
    o +5V : 6.82V(max.)
    o +3.3V : 4.5V(max.)

 *Specifications courtesy of Nexus Technology