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Corsair TX550M & TX750M Power Supply Review

paulktreg    -   February 21, 2012
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Testing:

Efficiency and Power Factor:

Efficiency is a measure of an ATX power supply’s ability to minimize power loss during the conversion of the AC mains voltage to multiple DC rails. It is a simple ratio of output power measured in watts over input power measured in watts, expressed as a percentage. It has no effect on the power supply’s ability to power a PC, though a higher efficiency brings forth less heat and lower utility bills. It is also “green” and friendlier to the environment, which is the driving force behind the 80 Plus certification program.

Power factor is a strange beast that’s difficult to fully explain without the use of complex AC theory, so let’s keep it simple. Power factor doesn’t have a unit of measurement – it’s a simple number from 0 to 1 that is concerned with the way various loads consume power, where the closer to unity the better. It is closely linked to 80 Plus certification because low power factors imply wasted energy that the normal domestic consumer does not get charged for but the utility companies still have to generate.

TX550M - Supply at 110VAC:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corsair TX550M 550W (CMPSU-550TXM) Efficiency & Power Factor
Supply = 110VAC/50Hz
DC Load (W)
0
110
281
521
DC Load As A Percent Of Max (%)
N/A
20
51
95
Efficiency (%)
N/A
81.5
83
80
Power Factor (PF)
0.57
0.97
0.99
0.99

 

The 80 Plus Bronze certificate requires 82%, 85%, and 82% efficiency at 20%, 50% and 100% DC load, respectively, with a power factor of 0.9 at 50% DC load. The TX550M falls a little short in OCC’s power supply testing methodology, but that isn't unusual. The power factor is well within specification and remained well over 0.9 from 20% to 100% DC loading.

 

TX550M - Supply at 230VAC:

 

 

Corsair TX550M 550W (CMPSU-550TXM) Efficiency & Power Factor
Supply = 230VAC/50Hz
DC Load (W)
0
108
280
525
DC Load As A Percent Of Max (%)
N/A
20
51
95
Efficiency (%)
N/A
82
83
83
Power Factor (PF)
0.13
0.88
0.96
0.98

 

The TX550M produced slightly better efficiency results when supplied from 230VAC and marginally lower power factors overall, although it still remained well over the specified lower limit of 0.9.

 

TX750M - Supply at 110VAC:

 

 

Corsair TX750M 750W (CMPSU-750TXM) Efficiency & Power Factor
Supply = 110VAC/50Hz
DC Load (W)
0
173
374
716
DC Load As A Percent Of Max (%)
N/A
23
50
95
Efficiency (%)
N/A
84
83
78
Power Factor (PF)
0.70
0.99
1.00
0.99

 

The TX750M efficiency, although good, tailed off on the approach to full load, which is unusual. Power factor levels, as usual, maintained above 0.9 at all times, between 20% and 100% DC loading.

 

TX750M - Supply at 230VAC:

 

 

Corsair TX750M 750W (CMPSU-750TXM) Efficiency & Power Factor
Supply = 230VAC/50Hz
DC Load (W)
0
171
374
717
DC Load As A Percent Of Max (%)
N/A
23
50
96
Efficiency (%)
N/A
86
85
82
Power Factor (PF)
0.16
0.92
0.97
0.99

 

Increasing the mains supply to 230VAC produced a slightly better efficiency and marginally reduced power factor levels, as is usually the case.

 

The TX550M and TX750M are both 80 Plus Bronze certified units and apart from an unusual dip in efficiency at approaching full DC load on the TX750M, they both presented satisfactory results. The rail loadings for 80 Plus certification are quite specific and it's difficult to replicate with the OCC power supply testing methodology, so it would be unfair to judge them too harshly in this section. A maximum measured efficiency of 83% on the TX550M and 86% on the TX750M is a satisfactory, although not remarkable, result in this section.




  1. Introduction & Closer Look
  2. Closer Look (The Power Supply)
  3. Specification & Features
  4. Testing: DC Voltage Load Regulation
  5. Testing: DC Voltage Load Regulation (Cont.)
  6. Testing: Efficiency, Power Factor
  7. Testing: DC Quality
  8. Testing: Temperature, Noise Level & Fan Speed
  9. Conclusion: TX550M
  10. Conclusion: TX750M
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