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Corsair SF450 Platinum SFX PSU Review

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

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 oscilloscope screenshots that we took during the hold-up time measurements:

The hold-up time is right on spot at 17ms, however the power ok signal is shorter than 16ms. It is accurate at least. In the scope screenshots we notice a low frequency ripple pattern on the standby signal, which is identical to the oscillation of the +12V rail.

Inrush Current

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

The inrush current might be low with 115V, but is on the high side with 230V.

Load Regulation And Efficiency Measurements

The first set of tests reveals the stability of the voltage rails and the SF450’s efficiency. The applied load equals (approximately) 10 to 110 percent of the power supplies 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 power supply 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.

Test # 12V 5V 3.3V 5VSB DC/AC (Watts) Efficiency Fan Speed (RPM) PSU Noise (dB[A]) Temps (In/Out) PF/AC Volts
1 1.925A 1.981A 1.969A 0.995A 44.859 84.997% 0 <6.0 44.32°C 0.870
12.081V 5.051V 3.350V 5.026V 52.777 39.82°C 115.05V
2 4.841A 2.971A 2.955A 1.195A 89.381 89.567% 0 <6.0 45.61°C 0.937
12.080V 5.051V 3.349V 5.021V 99.792 40.51°C 115.05V
3 8.152A 3.467A 3.435A 1.396A 134.485 91.120% 0 <6.0 46.63°C 0.960
12.080V 5.050V 3.348V 5.015V 147.591 41.19°C 115.05V
4 11.467A 3.963A 3.944A 1.597A 179.685 91.657% 1311 13.8 41.86°C 0.974
12.076V 5.049V 3.347V 5.010V 196.040 47.86°C 115.05V
5 14.450A 4.953A 4.931A 1.799A 224.988 91.785% 1393 15.7 42.15°C 0.981
12.075V 5.048V 3.346V 5.004V 245.126 48.48°C 115.05V
6 17.362A 5.946A 5.918A 2.001A 269.486 91.049% 1547 18.9 42.66°C 0.877
12.077V 5.047V 3.345V 4.998V 295.980 49.93°C 115.05V
7 20.342A 6.938A 6.906A 2.204A 314.785 91.078% 1728 22.0 43.00°C 0.987
12.077V 5.046V 3.345V 4.993V 345.623 50.83°C 115.04V
8 23.326A 7.931A 7.894A 2.407A 360.106 90.707% 1934 25.3 43.94°C 0.989
12.076V 5.046V 3.344V 4.987V 396.998 52.40°C 115.04V
9 26.707A 8.427A 8.376A 2.408A 405.004 90.376% 2174 28.3 44.52°C 0.990
12.075V 5.045V 3.343V 4.984V 448.130 53.55°C 115.04V
10 30.025A 8.926A 8.887A 2.510A 449.706 89.918% 2706 34.5 45.67°C 0.991
12.073V 5.044V 3.341V 4.980V 500.128 55.86°C 115.04V
11 33.744A 8.926A 8.892A 2.512A 494.517 89.481% 3184 38.7 46.88°C 0.992
12.070V 5.043V 3.341V 4.978V 552.651 57.67°C 115.04V
CL1 0.138A 12.002A 11.999A 0.000A 102.476 86.890% 742 6.5 42.21°C 0.948
12.095V 5.050V 3.350V 5.028V 117.938 48.51°C 115.05V
CL2 37.509A 1.002A 1.001A 1.000A 466.102 90.568% 2648 34.3 45.90°C 0.991
12.069V 5.046V 3.342V 5.005V 514.642 55.83°C 115.04V

The load regulation is super tight on all rails. Great Wall managed to greatly improve the original, Gold platform, in this section.

With 20% and 50% load levels the SF450 is not able to reach the required efficiency levels that the 80 PLUS Platinum standard asks for, while with full load it is close to the Titanium mark of 90%. We should stress that we conduct those tests at a very high ambient, contrary to the 80 PLUS organisation, so it is natural to measure lower efficiency levels. Under lower temperatures the efficiency will be increased in all cases.

The fan profile is highly relaxed and we have to push the unit very hard, and beyond its official limits, to make the fan spin at close to 3200 RPM where its output noise doesn’t breach the 40 dB(A) mark.

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