Xigmatek NRP-PC502 500W Power Supply Review

Testing (Continued):

Efficiency and Power Factor:

 

 

 

 

 

 

  

 

 

 

Output & Efficiency @ 110VAC
DC Load (W)	AC Load (W)	PF	Efficiency (%)	Pass/Fail
0	6	0.40	N/A	N/A
110	133	0.99	83	Pass
259	303	0.99	85	Pass
471	589	0.99	80	Pass

 

Output & Efficiency @ 230VAC
DC Load (W)	AC Load (W)	PF	Efficiency (%)	Pass/Fail
0	7	0.21	N/A	N/A
110	129	0.88	85	Pass
259	298	0.93	87	Pass
471	562	0.96	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 close, missing the 80 Plus Bronze requirements by two percent at 471W loading at 110VAC. I would expect most good quality power supplies to maintain their power factor at or above 0.9 for any load above 20% of their rated maximum. It's disappointing to see a power factor of 0.88 at 110W loading on 230VAC, but it meets the ATX12V V2.2, so technically speaking it's still a pass. 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 = 50mv/div, Timebase = 10uS/div

 

AC Ripple On 5V0 Rail at 230VAC

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

 

AC Ripple On 12V1 Rail at 230VAC

Oscilloscope settings: Amplitude = 100mv/div, Timebase = 10uS/div

 

AC Ripple/Noise
DC Rail	+3V3	+5V0	+12V	-12V0	+5VSB
Ripple (mV p-p)	200	150	150	200	80

 

The DC quality of the Xigmatek NRP-PC502 could be better, as it had far 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).