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XFX XPS-850W Power Supply Review

paulktreg    -   September 14, 2009
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Testing (Continued):

Efficiency and Power Factor:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

XFX Black Edition 850W
Output & Efficiency @ 110VAC
DC Load (W)
AC Load (W)
PF
Efficiency (%)
Pass/Fail
0
6
0.69
N/A
N/A
175
207
0.97
85
Pass
419
484
0.98
87
Pass
830
979
0.99
85
Pass

 

XFX Black Edition 850W
Output & Efficiency @ 230VAC
DC Load (W)
AC Load (W)
PF
Efficiency (%)
Pass/Fail
0
7
0.42
N/A
N/A
174
200
0.90
87
Pass
420
470
0.93
89
Pass
830
968
0.96
86
Pass

 

No problems here. The XFX Black Edition 850W meets the requirements of the ATX12V V2.2 specification with power factor levels above 0.9 at all times and excellent efficiency. I will have a little more to say in the conclusion regarding the efficiency and the 80 Plus Silver level claimed by the manufacturer.

 

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 = 5mV/div, Timebase = 5uS/div

 

AC Ripple On 5V0 Rail at 230VAC

Oscilloscope settings: Amplitude = 10mv/div, Timebase = 5uS/div

 

AC Ripple On 12V Rail at 230VAC

Oscilloscope settings: Amplitude = 5mv/div, Timebase = 5uS/div

 

XFX Black Edition 850W
AC Ripple/Noise @ 830W Loading
DC Rail
+3V3
+5V0
+12V
-12V0
+5VSB
Ripple (mV p-p)
35
30
20
20
50
Pass/Fail
Pass
Pass
Pass
Pass
Pass

 

Ripple/noise levels meet the ATX12V V2.2 specification at all times. The 12V rail levels are really excellent at only 20mV, but the +5VSB level is a little on the high side and came very close to exceeding the limits.

 




  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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