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Corsair AX850 850W Power Supply Review

paulktreg    -   September 22, 2010
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Testing:

Efficiency and Power Factor:

 

 

 

 

 

 

 

 

 

 

 

 

 

Testing for 80 Plus certification is almost always performed with the mains supply at 115 VAC nominal and 60 Hz no doubt to cater for the North American market. The requirements for Gold certification are 87%, 90%, 87% efficiency at 20%, 50%, 100% DC load with a power factor of >0.9 at 50% DC loading. The graphs above show the power factor levels are fine but the efficiency levels for 80 Plus Gold aren’t reached following the OCC testing methodology with the dip to 83% at full load a little unexpected.

 

 

The efficiency levels although not quite hitting 80 Plus Gold are better at 230 Vac but then this is usually the case and a maximum efficiency of 89%, following the OCC testing methodology, is still up there with other high end units.

It would be unfair to “fail” the power supply based on the OCC testing methodology because I can’t maintain the AC mains supply at exactly 115 V throughout testing and my rail loadings aren’t in line with the protocols laid down by the test specification. A great if not exceptional set of results in this section still make the Corsair AX850 one of the more efficient power supplies available at the present time.

 

 

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 there are any significant differences.

 

AC ripple/noise on the +3V3 rail at 230VAC

Oscilloscope settings: Amplitude = 5mV/div, Timebase = 20uS/div

 

AC ripple/noise on the +5V0 rail at 230VAC

Oscilloscope settings: Amplitude = 5mV/div, Timebase = 20uS/div

 

AC ripple/noise on the +12V rail at 230VAC

Oscilloscope settings: Amplitude = 5mV/div, Timebase = 20uS/div

 

AC ripple/noise on the -12V rail at 230VAC

Oscilloscope settings: Amplitude = 5mV/div, Timebase = 20uS/div

 

AC ripple/noise on the +5VSB rail at 230VAC

Oscilloscope settings: Amplitude = 5mV/div, Timebase = 20uS/div

 

Corsair AX850 850W (CMPSU-850AX) AC Ripple/Noise
Supply = 230VAC/50Hz DC Loading = 846W
DC Rail
+3V3
+5V0
+12V
-12V0
+5VSB
ATX12 Max (mV p-p)
50
50
120
120
50
Measured Ripple (mV p-p)
16
28
22
36
27
Pass/Fail
Pass
Pass
Pass
Pass
Pass

The Corsair AX850 power supply produced a low set of results for AC ripple/noise on all the rails and remained well within the levels set down by the ATX12V specification.




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