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Corsair AX1200 1200W Power Supply Review

paulktreg    -   July 7, 2010
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Testing:

Efficiency and Power Factor:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corsair AX1200 1200W (CMPSU-1200AX) Power Factor & Efficiency
Supply = 110Vac/50Hz
DC Load (W)
AC Load (W)
PF
Efficiency (%)
Pass/Fail
0
16
0.66
N/A
N/A
242
281
0.99
86
Pass
612
699
0.99
88
Pass
1186
1398
0.99
85
Pass

 

Corsair AX1200 1200W (CMPSU-1200AX) Power Factor & Efficiency
Supply = 230Vac/50Hz
DC Load (W)
AC Load (W)
PF
Efficiency (%)
Pass/Fail
0
16
0.23
N/A
N/A
241
278
0.93
87
Pass
612
675
0.97
91
Pass
1186
1358
0.99
87
Pass

 

The Corsair AX1200 power supply is the most efficient unit I’ve tested to date following the OCC power supply testing methodology. The 80 Plus gold standard requires efficiency levels of 87%, 90% and 87% efficiency at 20%, 50% and 100% DC loading with a power factor >0.9 at 50%. Power factor levels are fine but the efficiency levels, following the OCC testing methodology, are a little on the low side at 110Vac and just a pass at 230Vac, but for reasons I will explain later, won’t warrant a failure. The test protocol for 80 Plus certification is quite specific, not only for the overall DC load levels, 20%, 50% and 100%, but it also calls for specific loading on the DC rails which I found difficult to attain because of the nature of my test load. Expensive variable electronic loads, like the Chroma, are usually employed for this sort of testing, but because I’m using a network of fixed value wire wound resistors hitting specific rail loads, or at least getting close, it was difficult. The power supply manufacturers design and optimize their units to meet the requirements for 80 Plus, so failing a unit for the sake of a few percentage points, when I can’t quite hit the right loads, would be unfair. The Corsair AX1200 is a very efficient power supply that would I’m sure, with correctly spread DC rail loading, hit peak efficiency and meet the requirements of 80 Plus gold.

 

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 = 10uS/div

 

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

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

 

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

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

 

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

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

 

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

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

 

Corsair AX1200 1200W (CMPSU-1200AX) AC Ripple/Noise
Supply = 230Vac/50Hz DC Loading = 1186W
DC Rail
+3V3
+5V0
+12V
-12V0
+5VSB
ATX12 Max (mV p-p)
50
50
120
120
50
Ripple (mV p-p)
20
20
30
25
20
Pass/Fail
Pass
Pass
Pass
Pass
Pass

 

The noise/ripple levels on the Corsair AX1200 power supply rails all fell well within the limits laid down by the ATX12V V2.2 specification. A noise level on the 12V rail of only 30mV, peak to peak, when over 1kW of energy is being drawn is really excellent. No problems here, so let’s move on.




  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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