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Xigmatek NRP-PC402 400W Review

paulktreg    -   July 13, 2009
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Testing (Continued):

Efficiency and Power Factor:

 

 

 

 

 

 

 

Output & Efficiency @ 110VAC
DC Load (W)
AC Load (W)
PF
Efficiency (%)
Pass/Fail
0
0.6
0.58
N/A
N/A
110
132
0.99
83
Pass
216
257
0.99
84
Pass
406
493
0.99
82
Pass

 

Output & Efficiency @ 230VAC
DC Load (W)
AC Load (W)
PF
Efficiency (%)
Pass/Fail
0
6
0.21
N/A
N/A
110
130
0.94
85
Pass
217
252
0.95
86
Pass
401
477
0.97
84
Pass

 

In order to meet the requirements of the 80 Plus Bronze standard, the power supply must run with a power factor of 0.9 at 50% loading and an efficiency of 82% at 20%, 85% at 50% and 82% at 100% loading. All 80 Plus testing is done at 115VAC and 60Hz, probably due to the fact that it is a USA-based organization and all power supplies I have tested at 115VAC/60Hz will usually result in a pass at 230VAC/50Hz.

The Xigmatek doesn't quite make the mark following the OCC testing methodology, but it's pretty close, missing by just one percent at 216W loading and 110VAC. But it's possible that if I could have loaded at exactly 200W and powered from a 115VAC source, it may have passed. Putting its claimed 80 Plus Bronze certification aside, these results are still very good.

 

AC Ripple On DC Outputs:

 

I have consistently found the AC ripple levels on the DC rails to be more or less equal with a 110VAC or 230VAC mains supply. The results given below are for 230VAC only, but I will continue to check the levels at 110VAC during testing and publish them below if they differ in any way.

 

AC Ripple On 3V3 Rail at 230VAC

Oscilloscope settings: Amplitude = 10mv/div, Timebase = 10uS/div

 

AC Ripple On 5V0 Rail at 230VAC

Oscilloscope settings: Amplitude = 10mv/div, Timebase = 10uS/div

 

AC Ripple On 12V1 Rail at 230VAC

Oscilloscope settings: Amplitude = 50mv/div, Timebase = 10uS/div

 

AC Ripple/Noise
 
DC Rail
+3V3
+5V0
+12V
-12V0
+5VSB
Ripple (mV p-p) 60
 70
180 200
70

 

The DC quality of the Xigmatek NRP-PC402 could be better, as it had higher than permitted levels on all the rails according to the ATX12V V2.2 specification (3V3=50mV, 5V0=50mV, +12V=120mV, -12V=120mV and +5VSB=50mV).

 




  1. Introduction & Closer Look
  2. Closer Look (The Power Supply)
  3. Specification & Features
  4. Testing: DC Voltage Load Regulation at 110VAC & 230VAC
  5. Testing: Efficiency, Power Factor & DC Quality
  6. Testing: Temperature, Noise Level & Fan Speed
  7. Conclusion
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