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Corsair TX750W Review - Updated

paulktreg    -   November 23, 2008
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Testing (Continued):

The efficiency and power factor levels for the TX750W are good and meet the requirements of the claimed 80 Plus certification. The 110VAC efficiency at 747W does actually work out at ([747/938]*100) 79.64% but I do tend to round up and allow for some margin of error. The claimed 0.99 power factor isn't maintained at 230VAC but, as is usually the case, at 110VAC the power factor never drops below 0.99. The main market for Corsair is probably North America so is the specification for this, and other manufacturers power supplies, slightly biased toward the lower 110VAC mains supply?

Efficiency and Power Factor:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Output & Efficiency at 110VAC
DC Load (W)
AC Load (W)
PF
Efficiency (%)
Pass/Fail
0
10
0.59
N/A
N/A
145
180
0.99
80
Pass
395
475
1.00
83
Pass
747
938
1.00
80
Pass

 

Output & Efficiency at 230VAC
DC Load (W)
AC Load (W)
PF
Efficiency (%)
Pass/Fail
0
11
0.31
N/A
N/A
145
177
0.91
82
Pass
395
462
0.96
85
Pass
748
893
0.98
84
Pass

 

 

AC Ripple On DC Outputs:

 

First, and once again, I apologize for the poor quality photographs. My USB oscilloscope has gone to the "Electrical Items Only Skip" in the sky. The photographs below are from my trusty old CRT oscilloscope. It carries a valid calibration certificate but the triggering and focus could be better which is why the tracing appears blurred, it just refused to lock onto the high frequency signal. However, it does illustrate the amplitude of the signal, which to be honest, is all that I am interested in. I made ripple measurements at 230VAC and 110VAC but they are very similar (slightly higher at 230VAC) and the photographs below show 230VAC ripple only.

 

AC Ripple On 3V3 Rail at 230VAC

 

(Amplitude: 10mV/div | Timebase: 20uS/div)

 

 

AC Ripple On 5V0 Rail at 230VAC

 

(Amplitude: 10mV/div | Timebase: 20uS/div)

 

 

AC Ripple On 12V Rail at 230VAC

 

(Amplitude: 20mV/div | Timebase: 20uS/div)

 

 

Corsair TX750W AC Ripple/Noise Measurements

DC Output
+3V3
+5V0
+12V1
+12V2
-12V0
+5VSB
Ripple (mV p-p)
50
40
110
110
50
40
Pass/Fail
Pass
Pass
Pass
Pass
Pass
Pass

 

The AC ripple/noise levels on the Corsair TX750W meet the requirements of the ATX12V specification, but as you can see in the above table, they are quite close to the allowable maximum levels (50mV maximum for the 3V3 and 5V0 rails & 120mV maximum  for the +12V rail). Don't forget that these measurements have been taken with the power supply fully loaded.

 




  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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