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# Corsair HX1050 1050W Power Supply Review

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## Testing:

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

Short Circuit Protection:

I short circuited the 3V3, 5V0 and the 12V rail(s) in turn. The power supply did shut down, and once the short was removed and the unit switched off for at least one second, 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.

In an ideal world the ATX power supply, or any other for that matter, should maintain its DC rails at a constant voltage but 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, either side of 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

*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.

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 and the 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 and the quality of the regulation is a useful indicator of the power supply’s overall quality.

Mains Input Voltage 110VAC

 Corsair HX1050 1050W (CMPSU-1050HX) DC Output Voltage Load Regulation Supply = 117VAC/50Hz PSU DC Rail Rail Loading Measured Voltage Permitted Regulation Actual Regulation +3.3V 0 3.34 3.3V±5% +1.2% +5V 0 5.07 5.0V±5% +1.4% +12V 0 12.18 12.0V±5% +1.5% -12V 0 12.36 12.0V±10% +3.0% +5VSB 0 5.06 5.0V±5% +1.2% Total PSU DC Loading = 0W (0% of Rated Maximum Output Power)

 Corsair HX1050 1050W (CMPSU-1050HX) DC Output Voltage Load Regulation Supply = 115VAC/50Hz PSU DC Rail Rail Loading Measured Voltage Permitted Regulation Actual Regulation +3.3V 3.16A 3.32V 3.3V±5% +0.6% +5V 4.77A 5.05V 5.0V±5% +1.0% +12V 15.43A 12.14V 12.0V±5% +1.2% -12V 0.36A 11.95V 12.0V±10% -0.4% +5VSB 2.06A 4.94V 5.0V±5% -1.2% Total PSU DC Loading = 237W (22.5% of Rated Maximum Output Power)

 Corsair HX1050 1050W (CMPSU-1050HX) DC Output Voltage Load Regulation Supply = 113VAC/50Hz PSU DC Rail Rail Loading Measured Voltage Permitted Regulation Actual Regulation +3.3V 8.01A 3.29V 3.3V±5% -0.3% +5V 9.45A 5.01V 5.0V±5% +0.2% +12V 37.10A 12.07V 12.0V±5% +0.6% -12V 0.35A 11.97V 12.0V±10% -0.3% +5VSB 1.99A 4.89V 5.0V±5% -2.2% Total PSU DC Loading = 535W (51% of Rated Maximum Output Power)

 Corsair HX1050 1050W (CMPSU-1050HX) DC Output Voltage Load Regulation Supply = 107VAC/50Hz PSU DC Rail Rail Loading Measured Voltage Permitted Regulation Actual Regulation +3.3V 13.40A 3.25V 3.3V±5% -1.5% +5V 15.04A 4.95V 5.0V±5% -1.0% +12V 78.94A 12.01V 12.0V±5% +0.1% -12V 0.36A 11.92V 12.0V±10% -0.7% +5VSB 2.02A 4.85V 5.0V±5% -3.0% Total PSU DC Loading = 1080W (103% of Rated Maximum Output Power)

Mains Input Voltage 230VAC

 Corsair HX1050 1050W (CMPSU-1050HX) DC Output Voltage Load Regulation Supply = 245VAC/50Hz PSU DC Rail Rail Loading Measured Voltage Permitted Regulation Actual Regulation +3.3V 0 3.34V 3.3V±5% +1.2% +5V 0 5.07V 5.0V±5% +1.4% +12V 0 12.18V 12.0V±5% +1.5% -12V 0 12.36V 12.0V±10% +3.0% +5VSB 0 5.06V 5.0V±5% +1.2% Total PSU DC Loading = 0W (0% of Rated Maximum Output Power)

 Corsair HX1050 1050W (CMPSU-1050HX) DC Output Voltage Load Regulation Supply = 244VAC/50Hz PSU DC Rail Rail Loading Measured Voltage Permitted Regulation Actual Regulation +3.3V 3.16A 3.32V 3.3V±5% +0.6% +5V 4.84A 5.05V 5.0V±5% +1.0% +12V 15.71A 12.14V 12.0V±5% +1.2% -12V 0.36A 11.94V 12.0V±10% -0.5% +5VSB 10.22A 4.96V 5.0V±5% -0.8% Total PSU DC Loading = 240W (23% of Rated Maximum Output Power)

 Corsair HX1050 1050W (CMPSU-1050HX) DC Output Voltage Load Regulation Supply = 242VAC/50Hz PSU DC Rail Rail Loading Measured Voltage Permitted Regulation Actual Regulation +3.3V 8.31A 3.29V 3.3V±5% -0.3% +5V 9.62A 5.01V 5.0V±5% +0.2% +12V 37.77A 12.07V 12.0V±5% +0.6% -12V 0.35A 11.98V 12.0V±10% -0.2% +5VSB 1.99A 4.88V 5.0V±5% -2.4% Total PSU DC Loading = 545W (52% of Rated Maximum Output Power)

 Corsair HX1050 1050W (CMPSU-1050HX) DC Output Voltage Load Regulation Supply = 233VAC/50Hz PSU DC Rail Rail Loading Measured Voltage Permitted Regulation Actual Regulation +3.3V 13.21A 3.25V 3.3V±5% -1.5% +5V 14.54A 4.95V 5.0V±5% -1.0% +12V 78.74A 12.00V 12.0V±5% 0% -12V 0.36A 12.01V 12.0V±10% +0.1% +5VSB 2.02A 4.86V 5.0V±5% -2.8% Total PSU DC Loading = 1074W (102% of Rated Maximum Output Power)

The Corsair HX1050 produced an excellent set of results in this section. The regulation is about as good as it gets with the major rails, +3V3, +5V and +12V, holding well within ±2% of the required voltages. The +5VSB and -12V rail didn't perform as well (not unusual), but still remained well within the limits set down by the ATX12V V2.2 specification.

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