Corsair CX450 PSU Review: Two Flavors, Tested and Compared

Load Regulation, Hold-Up Time & Inrush Current

To learn more about our PSU tests and methodology, please check out How We Test PSUs. 

Primary Rails and 5VSB Load Regulation

Load regulation testing is detailed here.

Hold-Up Time

Our hold-up time tests are described in detail here.

The hold-up time was very low, but at least the power-good signal was accurate. CWT's design performed better, despite its lower-capacity bulk cap. However, it still fell short of the 17 millisecond (ms) hold-up time that the ATX spec requires.

Inrush Current

For details on our inrush current testing, please click here.

We measured high inrush currents from Great Wall's platform with 230V input, while CWT's fared notably better with both voltage inputs.

Load Regulation & Efficiency Measurements

The first set of tests revealed the stability of the voltage rails and the CX450’s efficiency. The applied load equals (approximately) 10 to 110 percent of the PSU's maximum load in increments of 10 percentage points.

We conducted two additional tests. During the first, we stressed the two minor rails (5V and 3.3V) with a high load, while the load at +12V was only 0.1A. This test reveals whether a PSU is compatible with Intel's C6/C7 sleep states or not. In the second test, we determined the maximum load the +12V rail could handle with minimal load on the minor rails.

Corsair CX450 - CWT

Test #12V5V3.3V5VSBDC/AC (Watts)EfficiencyFan Speed
PSU Noise
Temps (In/Out)PF/AC Volts
11.925A1.974A1.998A0.986A44.75576.962%818 RPM13.8 dB(A)37.88°C0.977
12.056V5.053V3.296V5.058V58.15244.53°C115.12V
24.888A2.962A3.002A1.186A89.72783.357%818 RPM13.8 dB(A)38.08°C0.991
12.047V5.052V3.294V5.049V107.64245.12°C115.12V
38.208A3.467A3.519A1.386A134.89985.645%818 RPM13.8 dB(A)38.55°C0.995
12.039V5.050V3.293V5.041V157.51046.96°C115.12V
411.520A3.961A4.006A1.585A179.79086.487%818 RPM13.8 dB(A)39.06°C0.996
12.033V5.049V3.293V5.034V207.88148.52°C115.12V
514.490A4.960A5.010A1.791A224.79486.423%1015 RPM21.1 dB(A)39.74°C0.997
12.027V5.048V3.290V5.026V260.11049.64°C115.12V
617.481A5.946A6.017A1.991A269.74186.157%1286 RPM28.5 dB(A)40.52°C0.998
12.011V5.045V3.289V5.017V313.08150.58°C115.12V
720.458A6.944A7.022A2.196A314.71585.560%1578 RPM34.1 dB(A)41.67°C0.998
12.006V5.043V3.287V5.007V367.83052.20°C115.12V
823.440A7.935A8.034A2.400A359.67684.894%1630 RPM35.1 dB(A)42.14°C0.998
12.000V5.042V3.285V4.998V423.67953.14°C115.12V
926.871A8.439A8.553A2.401A404.80084.164%1630 RPM35.1 dB(A)44.01°C0.998
11.990V5.041V3.284V4.993V480.96556.41°C115.12V
1030.031A8.936A9.042A3.011A449.57083.142%1630 RPM35.1 dB(A)45.34°C0.998
11.983V5.039V3.284V4.977V540.72360.06°C115.12V
1133.815A8.934A9.044A3.015A494.53482.117%1630 RPM35.1 dB(A)46.52°C0.998
11.972V5.039V3.283V4.972V602.23464.16°C115.12V
CL10.100A13.019A13.004A0.005A109.75880.682%1381 RPM30.8 dB(A)44.16°C0.993
12.046V5.049V3.291V5.047V136.03853.00°C115.13V
CL237.478A1.004A1.003A1.002A462.34883.718%1630 RPM35.1 dB(A)44.95°C0.998
11.979V5.046V3.289V5.024V552.26859.21°C115.12V

Corsair CX450 - Great Wall

Test #12V5V3.3V5VSBDC/AC (Watts)EfficiencyFan Speed
PSU Noise
Temps (In/Out)PF/AC Volts
11.924A1.995A1.982A0.996A44.81380.582%1230 RPM
27.6 dB(A)
40.07°C0.955
12.070V5.008V3.328V5.023V55.61245.61°C115.31V
24.841A2.998A2.976A1.197A89.31985.465%1340 RPM29.3 dB(A)40.76°C0.981
12.066V5.006V3.326V5.014V104.50946.71°C115.25V
38.162A3.498A3.457A1.398A134.42887.103%1395 RPM31.5 dB(A)41.09°C0.988
12.060V5.004V3.324V5.007V154.33348.21°C115.19V
411.484A3.997A3.973A1.601A179.64487.516%1575 RPM35.1 dB(A)41.74°C0.990
12.056V5.003V3.321V4.998V205.26950.76°C115.13V
514.475A5.000A4.971A1.804A224.92787.265%1710 RPM37.7 dB(A)42.12°C0.992
12.050V5.001V3.319V4.989V257.75151.89°C115.07V
617.403A6.003A5.966A2.008A269.43686.899%1865 RPM40.2 dB(A)42.81°C0.993
12.046V4.999V3.317V4.981V310.05753.15°C115.10V
720.396A7.006A6.967A2.213A314.72986.036%1865 RPM40.2 dB(A)43.11°C0.994
12.042V4.998V3.316V4.971V365.80954.46°C115.03V
823.392A8.007A7.966A2.419A360.02985.148%1865 RPM40.2 dB(A)43.83°C0.995
12.039V4.997V3.314V4.962V422.82855.64°C114.97V
926.793A8.508A8.456A2.421A404.93583.918%1870 RPM40.3 dB(A)44.22°C0.995
12.034V4.995V3.312V4.958V482.53956.86°C114.89V
1029.931A9.014A8.975A3.038A449.75582.743%1865 RPM40.2 dB(A)45.32°C0.994
12.029V4.993V3.310V4.938V543.55558.66°C114.87V
1133.661A9.014A8.974A3.042A494.58381.830%1865 RPM40.2 dB(A)46.51°C0.994
12.028V4.993V3.309V4.933V604.40560.88°C114.85V
CL10.136A13.001A12.999A0.000A109.90581.270%1862 RPM40.1 dB(A)43.10°C0.987
12.056V5.004V3.324V5.029V135.23454.76°C115.21V
CL237.419A1.003A1.001A1.000A463.77683.467%1873 RPM40.3 dB(A)45.55°C0.995
12.038V4.999V3.314V4.994V555.63959.00°C114.91V

Both PSUs demonstrated good load regulation. However, Great Wall's version won in this particular comparison. Its fan spun aggressively once the operating temperatures started climbing. But we expected that from a lower-efficiency power supply. On the other hand, though, CWT's fan profile was more relaxed under the same operating conditions.

The two CX450s delivered their full power without any problems at ambient temperatures greater than 46°C (113°F) . And both easily met 80 PLUS requirements for Bronze certification, even under our tough operating conditions. 

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