Corsair CX450 PSU Review: Two Flavors, Tested and Compared

Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the CX450’s rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V and 5VSB).

Corsair CX450 - CWT

10% Load15.3mV8.3mV9.2mV6.2mVPass
20% Load20.0mV8.2mV9.9mV7.0mVPass
30% Load19.2mV8.2mV10.0mV7.3mVPass
40% Load19.6mV9.2mV10.5mV7.8mVPass
50% Load32.5mV9.1mV11.4mV8.2mVPass
60% Load32.3mV8.5mV12.0mV8.5mVPass
70% Load33.9mV10.4mV17.6mV8.7mVPass
80% Load28.3mV11.3mV15.6mV11.5mVPass
90% Load29.0mV12.3mV16.1mV12.1mVPass
100% Load30.6mV12.6mV17.0mV14.1mVPass
110% Load32.1mV13.5mV17.7mV16.3mVPass
Cros-Load 126.1mV7.3mV11.0mV8.7mVPass
Cross-Load 233.8mV13.7mV16.1mV12.2mVPass

Corsair CX450 - Great Wall

10% Load22.8mV7.4mV7.1mV6.5mVPass
20% Load35.3mV8.8mV8.3mV7.0mVPass
30% Load54.7mV10.0mV9.2mV7.6mVPass
40% Load41.7mV10.6mV10.5mV8.1mVPass
50% Load37.1mV12.1mV11.5mV9.0mVPass
60% Load35.7mV14.4mV12.3mV9.8mVPass
70% Load35.3mV14.8mV14.0mV11.1mVPass
80% Load36.6mV14.7mV14.9mV12.8mVPass
90% Load39.0mV15.6mV16.7mV14.6mVPass
100% Load44.2mV17.9mV18.1mV14.9mVPass
110% Load48.1mV20.0mV18.6mV20.1mVPass
Cross-Load 154.1mV13.9mV15.5mV10.7mVPass
Cross-Load 245.2mV14.8mV13.7mV15.7mVPass

Comparison Graphs

The Great Wall-based unit's minor rails performed well. But ripple at +12V was higher than what we measured from CWT's model. That latter design served up excellent ripple suppression on all of its rails. To be sure, you don't often see 31 millivolt (mV) of ripple under full load at 47°C from a budget-oriented PSU.

Ripple Oscilloscope Screenshots - Great Wall

The following oscilloscope screenshots illustrate the AC (alternating current) ripple and noise registered on the main rails (+12V, 5V, 3.3V and 5VSB). The bigger the fluctuations on the screen, the bigger the ripple/noise. We set 0.01 V/Div (each vertical division/box equals 0.01V) as the standard for all measurements.  

Ripple at Full Load

Ripple at 110 Percent Load

Ripple at Cross-Load 1

Ripple at Cross-Load 2

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