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Seasonic X Series 760W Power Supply Review

paulktreg    -   January 19, 2011
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Testing:

Efficiency and Power Factor:

 

 

 

 

 

 

 

 

 

 

 

I think this is the first time a power supply as produced efficiency levels that meet its certified 80 Plus level following the OCC testing methodology. It’s not usually a defect in the power supply but more my inability to exactly follow the testing protocol used by the 80 Plus organisation which leads to lower, but not by much, measured efficiency levels. The Seasonic X-Series 760W produced efficiency levels of 87%, 90% and 87% whilst powered from 110VAC that exactly meet the 80 Plus Gold requirements. Power factor levels are fine but then again they usually are with a basic requirement of 0.9 or better at 50% loading.

 

 

The Seasonic X-Series 760W power supply excels even further when powered from 230VAC with efficiency levels of 89%, 92% and 89% with power factor levels once again proving to be well within the required levels.

The Seasonic X-Series 760W is one of the most efficient power supplies I’ve tested for OCC so let’s move on and have a look at the DC quality.

 

AC Ripple On DC Outputs:

 

I have consistently found the AC ripple levels on the DC rails to be more or less equal with an 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

 

Seasonic X-Series 760W (SS-760KM Active PFC F3) AC Ripple/Noise
Supply = 230VAC/50Hz DC Loading = 798W
DC Rail
+3V3
+5V0
+12V
-12V0
+5VSB
ATX12 Max (mV p-p)
50
50
120
120
50
Ripple (mV p-p)
25
25
25
30
25
Pass/Fail
Pass
Pass
Pass
Pass
Pass

The noise/ripple levels on the DC rails of the Seasonic X-Series 760W power supply are well within the requirements laid down by the ATX12V V2.2 specification. I’ve seen lower levels on other power supplies in this class but they are perfectly acceptable and only 25mV on the 12V rail is still very good. 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
  5. Testing: Efficiency, Power Factor & DC Quality
  6. Testing: Temperature, Noise Level & Fan Speed
  7. Conclusion
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