Corsair CX450 PSU Review: Two Flavors, Tested and Compared

Protection Features & DC Power Sequencing

Protection Features

Check out our PSUs 101 article to learn more about PSU protection features. We describe our protection features evaluation methodology in detail here.

CX450 (CWT) Protection Features 
OCP12V: 45.2A (120.86%)
5V: 32.15A (160.75%)
3.3V: 33.85A (169.25%)
5VSB: 5.8A (193.33%), 76mV Ripple
OPP542.026W (120.45%)
OTP✓ (175°C @ secondary side)
SCP12V: ✓
5V: ✓
3.3V: ✓
5VSB: ✓
-12V: ✓
PWR_OKOperates properly
NLO
SIPSurge: MOV
Inrush: NTC thermistor
CX450 (Great Wall) Protection Features
OCP12V: 47.4A (126.74%), 12.018V
5V: 32.3A (161.5%), 4.998V
3.3V: 35.3A (176.5%), 3.312V
5VSB: 5.3A (176.67%), 4.919V
OPP567.995W (126.22%)
OTP✓ (190°C @ secondary side)
SCP12V: ✓
5V: ✓
3.3V: ✓
5VSB: ✓
-12V: ✓
PWR_OKOperates properly
NLO
SIPSurge: MOV
Inrush: NTC thermistor

It was nice to see over-temperature protection present in these budget-oriented PSUs. Their power-good signals were also accurate (though hold-up time was low in both cases).Both PSUs sport protection features with similar thresholds. The only notable exception is the CWT model's 5VSB rail. OCP (over-current protection) was set pretty high, allowing ripple to get out of control.

DC Power Sequencing (CX450 - Great Wall)

According to Intel’s most recent Power Supply Design Guide (revision 1.4), the +12V and 5V voltages must be equal to or greater than the 3.3V rail’s output at all times.

For our first measurement, we turned the PSU off and switched it back on without any load. Next, we set the PSU to standby mode, dialed full load and then started the PSU. In the last test, while the PSU was completely off (we cut power or switched the PSU off), we dialed full load before restoring power.

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