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Ultra LSX 750W Power Supply Review

paulktreg    -   December 1, 2010
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Testing:

Efficiency and Power Factor:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The Ultra LSX 750W power supply is 80 Plus Bronze certified and claims an efficiency of 85% at typical loads. It marginally failed to meet the required levels for 80 Plus following the OCC power supply testing methodology by one or two percentage points, but as I have said before, I was unable to exactly match the mains input voltage and DC load levels used during 80 Plus testing, so it would be unfair to mark the power supply down in this section. The 80 Plus Bronze requirements for power factor is 0.9 at 50% loading, which is easily met and, in combination with a maximum efficiency of 85%, puts the Ultra LSX 750W power supply on equal par with other power supplies in its class.

 

 

The Ultra LSX 750W power supply produced better efficiency and slightly lower power factor levels when supplied with a mains input voltage of 230VAC, but that's to be expected. I've never seen a power supply awarded 80 Plus status at 230VAC, so it doesn't apply here, but there would be little point - if a power supply passes at 115VAC, it's more or less guaranteed to pass at 230VAC.

 

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 = 2mv/div, Timebase = 20uS/div

 

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

Oscilloscope settings: Amplitude = 2mv/div, Timebase = 20uS/div

 

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

Oscilloscope settings: Amplitude = 2mv/div, Timebase = 20uS/div

 

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

Oscilloscope settings: Amplitude = 2mv/div, Timebase = 20uS/div

 

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

Oscilloscope settings: Amplitude = 2mv/div, Timebase = 20uS/div

 

Ultra LSX 750W (U12-40874) AC Ripple/Noise
Supply = 230VAC/50Hz DC Loading = 758W
DC Rail
+3V3
+5V0
+12V
-12V0
+5VSB
ATX12 Max (mV p-p)
50
50
120
120
50
Ripple (mV p-p)
10
10
15
15
15
Pass/Fail
Pass
Pass
Pass
Pass
Pass

The Ultra LSX 750W power supply exhibited some of the lowest noise/ripple levels I've seen in a while, with the results across the board falling well below the ATX12V V2.2 specified limits. Excellent!




  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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