Corsair TX550M & TX750M Power Supply Review

Testing:

TX550M - AC Ripple on DC Outputs:

I have consistently found the AC ripple levels on the DC rails to be more or less equal between an 110VAC and 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 = 10mV/div, Timebase = 20mS/div

 

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

Oscilloscope settings: Amplitude = 10mV/div, Timebase = 20mS/div

 

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

Oscilloscope settings: Amplitude = 10mV/div, Timebase = 20mS/div

 

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

Oscilloscope settings: Amplitude = 10mV/div, Timebase = 20mS/div

 

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

Oscilloscope settings: Amplitude = 10mV/div, Timebase = 20mS/div

 

Corsair TX550M 550W (CMPSU-550TXM) AC Ripple/Noise
Supply = 230VAC/50Hz DC Loading = 525W
DC Rail	+3V3	+5V0	+12V	-12V0	+5VSB
ATX12 Max (mV p-p)	50	50	120	120	50
Ripple (mV p-p)	38	46	47	95	45
Pass/Fail	Pass	Pass	Pass	Pass	Pass

 

The results in this section are marginal, but still maintained within the limits set down by the ATX12V V2.2 specification – a pass for the TX550M in this section, but only just.

 

TX750M - AC Ripple On DC Outputs:

 

I have consistently found the AC ripple levels on the DC rails to be more or less equal between an 110VAC and 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 = 10mV/div, Timebase = 20mS/div

 

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

Oscilloscope settings: Amplitude = 10mV/div, Timebase = 20mS/div

 

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

Oscilloscope settings: Amplitude = 10mV/div, Timebase = 20mS/div

 

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

Oscilloscope settings: Amplitude = 10mV/div, Timebase = 20mS/div

 

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

Oscilloscope settings: Amplitude = 10mV/div, Timebase = 20mS/div

 

Corsair TX750M 750W (CMPSU-750TXM) AC Ripple/Noise
Supply = 230VAC/50Hz DC Loading = 717W
DC Rail	+3V3	+5V0	+12V	-12V0	+5VSB
ATX12 Max (mV p-p)	50	50	120	120	50
Ripple (mV p-p)	49	45	94	95	44
Pass/Fail	Pass	Pass	Pass	Pass	Pass

 

The results in this section are marginal but still maintained within the limits set down by the ATX12V V2.2 specification – a pass for the TX750M as well, but only just.