Welcome Stranger to OCC!Login | Register

Corsair TX550M & TX750M Power Supply Review

paulktreg    -   February 21, 2012
» Discuss this article (3)

Lowest Prices

Testing:

For more information on how we test our power supplies, please browse our testing methodology.

Throughout the tables, all passes will be highlighted with green text and failures in red.

 

Short Circuit Protection:

To test this, I short circuited the 3V3, 5V0, and the 12V rail(s). Expectedly, the power supply shut down. Once the short was removed and the unit switched off for at least one second, it resumed normal operation. Although listed here at the beginning of the testing section, I tend to leave this test until the very end, in case it doesn't quite go to plan.

 

DC Output Voltage Load Regulation:

In an ideal world, the ATX power supply, or any other form factor for that matter, should maintain its DC rails at a constant voltage, though this is very difficult to achieve due to variations in the AC mains supply and changing DC load levels. The ATX12V V2.2 specification limits for this variation, expressed as a percentage above or below the ideal voltage, are given in the table below.

 

PSU Rail
Range
Minimum
Nominal
Maximum
+3V3
±5%
+3.14V
+3.30V
+3.47V
+5V
±5%
+4.75V
+5.00V
+5.25V
+12V
±5%*
+11.40V
+12.00V
+12.60V
-12V
±10%
-10.80V
-12.00V
-13.20V
+5VSB
±5%
+4.75V
+5.00V
+5.25V

 

*Note: The +12V rail is permitted to go to ±10% at its rated maximum DC load.*

There is no unit associated with voltage regulation – it is a simple ratio expressed as a percentage:

Voltage regulation VR= ([V no load – V full load] / V full load) x 100%

This equation is used to measure the voltage regulation of a simple single rail power supply but measuring the voltage regulation of the ATX power supply and the difference from the specified rail voltage will require a slightly different tack.

ATX Power Supply regulation = ([V measured - V specified] / V measured) x 100%

This will give the difference as a percentage from the specified rail voltage; +3.3V, +5V, +12V, etc.

There will be very few, if any, power supply failures in this section. The switched mode power supply is very good at maintaining its rail(s) at the correct voltage; they are constantly monitored and any changes are instantly fed back to the control circuitry, with necessary adjustments made to correct any error. So why test? The tighter the regulation the better; ±5% is acceptable, ±3% is very good, and ±2% is excellent. The quality of the regulation is a useful indicator of the power supply’s overall quality.

 

TX550M - Mains Input Voltage 110VAC

 

 

Corsair TX550M 550W (CMPSU-550TXM) DC Output Voltage Load Regulation
Supply = 117VAC/50Hz
PSU DC Rail
Rail Loading
Measured Voltage
Permitted Regulation
Actual Regulation
+3.3V
0
3.32V
3.3V±5%
+0.6%
+5V
0
5.05V
5.0V±5%
+1.0%
+12V
0
12.10V
12.0V±5%
+0.8%
-12V
0
11.85V
12.0V±10%
-1.3%
+5VSB
0
5.06V
5.0V±5%
+1.2%
Total PSU DC Loading = 0W (0% of Rated Maximum Output Power)

 

Corsair TX550M 550W (CMPSU-550TXM) DC Output Voltage Load Regulation
Supply = 115VAC/50Hz
PSU DC Rail
Rail Loading
Measured Voltage
Permitted Regulation
Actual Regulation
+3.3V
3.08A
3.28V
3.3V±5%
-0.6%
+5V
4.69A
5.00V
5.0V±5%
0
+12V
5.08A
12.05V
12.0V±5%
+0.4%
-12V
0.34A
11.74V
12.0V±10%
-2.2%
+5VSB
2.05A
4.97V
5.0V±5%
-0.6%
Total PSU DC Loading = 110W (20% of Rated Maximum Output Power)

 

Corsair TX550M 550W (CMPSU-550TXM) DC Output Voltage Load Regulation
Supply = 114VAC/50Hz
PSU DC Rail
Rail Loading
Measured Voltage
Permitted Regulation
Actual Regulation
+3.3V
7.99A
3.23V
3.3V±5%
-2.1%
+5V
9.51A
4.92V
5.0V±5%
-1.6%
+12V
16.34A
11.94V
12.0V±5%
-0.5%
-12V
0.35A
11.99V
12.0V±10%
0
+5VSB
2.02A
4.87V
5.0V±5%
-2.6%
Total PSU DC Loading = 281W (51% of Rated Maximum Output Power)

 

Corsair TX550M 550W (CMPSU-550TXM) DC Output Voltage Load Regulation
Supply = 113VAC/50Hz
PSU DC Rail
Rail Loading
Measured Voltage
Permitted Regulation
Actual Regulation
+3.3V
12.68A
3.20V
3.3V±5%
-3.0%
+5V
14.37A
4.87V
5.0V±5%
-2.6%
+12V
33.36A
11.88V
12.0V±5%
-1.0%
-12V
0.36A
12.16V
12.0V±10%
+1.3%
+5VSB
2.00A
4.82V
5.0V±5%
-3.6%
Total PSU DC Loading = 521W (95% of Rated Maximum Output Power)

 

TX750M - Mains Input Voltage 230VAC

 

 

Corsair TX550M 550W (CMPSU-550TXM) DC Output Voltage Load Regulation
Supply = 246VAC/50Hz
PSU DC Rail
Rail Loading
Measured Voltage
Permitted Regulation
Actual Regulation
+3.3V
0
3.32V
3.3V±5%
+0.6%
+5V
0
5.06V
5.0V±5%
+1.2%
+12V
0
12.10V
12.0V±5%
+0.8%
-12V
0
11.86V
12.0V±10%
-1.2%
+5VSB
0
5.06V
5.0V±5%
+1.2%
Total PSU DC Loading = 0W (0% of Rated Maximum Output Power)

 

Corsair TX550M 550W (CMPSU-550TXM) DC Output Voltage Load Regulation
Supply = 244VAC/50Hz
PSU DC Rail
Rail Loading
Measured Voltage
Permitted Regulation
Actual Regulation
+3.3V
3.12A
3.28V
3.3V±5%
-0.6%
+5V
4.66A
5.00V
5.0V±5%
0
+12V
5.08A
12.04V
12.0V±5%
+0.3%
-12V
0.34A
11.75V
12.0V±10%
-2.1%
+5VSB
2.05A
4.96V
5.0V±5%
-0.8%
Total PSU DC Loading = 108W (20% of Rated Maximum Output Power)

 

Corsair TX550M 550W (CMPSU-550TXM) DC Output Voltage Load Regulation
Supply = 244VAC/50Hz
PSU DC Rail
Rail Loading
Measured Voltage
Permitted Regulation
Actual Regulation
+3.3V
7.98A
3.21V
3.3V±5%
-2.7%
+5V
9.35A
4.91V
5.0V±5%
-1.8%
+12V
16.31A
11.94V
12.0V±5%
-0.5%
-12V
0.35A
11.96V
12.0V±10%
-0.3%
+5VSB
2.01A
4.85V
5.0V±5%
-3.0%
Total PSU DC Loading = 280W (51% of Rated Maximum Output Power)

 

Corsair TX550M 550W (CMPSU-550TXM) DC Output Voltage Load Regulation
Supply = 243VAC/50Hz
PSU DC Rail
Rail Loading
Measured Voltage
Permitted Regulation
Actual Regulation
+3.3V
12.88A
3.18V
3.3V±5%
-3.6%
+5V
14.40A
4.87V
5.0V±5%
-2.6%
+12V
33.75A
11.87V
12.0V±5%
-1.1%
-12V
0.36A
12.20V
12.0V±10%
+1.6%
+5VSB
2.01A
4.81V
5.0V±5%
-3.8%
Total PSU DC Loading = 525W (95% of Rated Maximum Output Power)

 

The Corsair TX550M produced a satisfactory set of results in this section with the three main rails staying within the limits set down by the ATX12V specification with a worst case regulation of -3.3% on the +3.3V rail.




  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
Random Pic
© 2001-2014 Overclockers Club ® Privacy Policy

Also part of our network: TalkAndroid, Android Forum, iPhone Informer, Neoseeker, and Used Audio Classifieds

Elapsed: 0.1350500584