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Cooler Master Silent Pro 1200W Power Supply Review

paulktreg    -   July 25, 2010
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Testing:

Efficiency and Power Factor:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) Power Factor & Efficiency
Supply = 110Vac/50Hz
DC Load (W)
AC Load (W)
PF
Efficiency (%)
Pass/Fail
0
16
0.46
N/A
N/A
242
284
0.96
85
Pass
590
686
0.98
86
Pass
1162
1421
0.98
82
Pass

 

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) Power Factor & Efficiency
Supply = 230Vac/50Hz
DC Load (W)
AC Load (W)
PF
Efficiency (%)
Pass/Fail
0
16
0.32
N/A
N/A
242
282
0.90
86
Pass
597
682
0.94
87
Pass
1162
1385
0.96
84
Pass

 

The Cooler Master Silent Pro Gold 1200W scored some decent figures for efficiency, following the OCC power supply testing methodology, although it didn't quite reach the requirements of 80 Plus Gold certification. The 80 Plus Gold standard requires efficiency levels of 87%, 90% and 87% efficiency at 20%, 50% and 100% DC loading, respectively, with a power factor >0.9 at 50%. The required power factor is easily reached, but the overall efficiency levels are a little low, with a noticeable dip at full load. The efficiency easily meets the requirements of the ATX12V V2.2 specification and, although gold levels aren't reached following the OCC power supply testing methodology, maximum efficiency is in the high eighties.

 

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 = 50mv/div, Timebase = 5uS/div

 

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

Oscilloscope settings: Amplitude = 50mv/div, Timebase = 5uS/div

 

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

Oscilloscope settings: Amplitude = 50mv/div, Timebase = 5uS/div

 

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

Oscilloscope settings: Amplitude = 50mv/div, Timebase = 5uS/div

 

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

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

 

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) AC Ripple/Noise
Supply = 230Vac/50Hz DC Loading = 1162W
DC Rail
+3V3
+5V0
+12V
-12V0
+5VSB
ATX12 Max (mV p-p)
50
50
120
120
50
Ripple (mV p-p)
150
150
90
200
60
Pass/Fail
Fail
Fail
Pass
Fail
Fail

 

The AC noise/ripple levels put out by the Cooler Master Silent Pro Gold 1200W are, to say the least, a little disappointing and fail to meet the requirements of the ATX12V V2.2 specification on all but the +12V rail. Will levels of this magnitude have any detrimental effects on PC stability? The answer is probably not because motherboards have AC noise/ripple suppression filtering built in and these levels will be far lower than any low end generic power supply, but it is nonetheless a failure for which the Cooler Master Silent Pro Gold 1200W must be marked down.




  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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