Corsair SF450 Platinum SFX PSU Review: Best of the Best

Load Regulation, Hold-Up Time and Inrush Current

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

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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 SF450 Platinum's hold-up time is higher than 17ms. However, its power-good signal doesn't reach 16ms, as the ATX spec requires. For us, what matters most is that it is accurate.

Inrush Current

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

Inrush current is low enough with 115V and more than double with 230V input.

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 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.

Test #12V5V3.3V5VSBDC/AC (Watts)EfficiencyFan Speed
PSU Noise
Temps (In/Out)PF/AC Volts
11.925A1.981A1.969A0.995A44.85984.997%0 RPM
<6.0 dB(A)
44.32°C0.870
12.081V5.051V3.350V5.026V52.77739.82°C115.05V
24.841A2.971A2.955A1.195A89.38189.567%0 RPM<6.0 dB(A)45.61°C0.937
12.080V5.051V3.349V5.021V99.79240.51°C115.05V
38.152A3.467A3.435A1.396A134.48591.120%0 RPM<6.0 dB(A)46.63°C0.960
12.080V5.050V3.348V5.015V147.59141.19°C115.05V
411.467A3.963A3.944A1.597A179.68591.657%1311 RPM13.8 dB(A)41.86°C0.974
12.076V5.049V3.347V5.010V196.04047.86°C115.05V
514.450A4.953A4.931A1.799A224.98891.785%1393 RPM15.7 dB(A)42.15°C0.981
12.075V5.048V3.346V5.004V245.12648.48°C115.05V
617.362A5.946A5.918A2.001A269.48691.049%1547 RPM18.9 dB(A)42.66°C0.877
12.077V5.047V3.345V4.998V295.98049.93°C115.05V
720.342A6.938A6.906A2.204A314.78591.078%1728 RPM22.0 dB(A)43.00°C0.987
12.077V5.046V3.345V4.993V345.62350.83°C115.04V
823.326A7.931A7.894A2.407A360.10690.707%1934 RPM25.3 dB(A)43.94°C0.989
12.076V5.046V3.344V4.987V396.99852.40°C115.04V
926.707A8.427A8.376A2.408A405.00490.376%2174 RPM28.3 dB(A)44.52°C0.990
12.075V5.045V3.343V4.984V448.13053.55°C115.04V
1030.025A8.926A8.887A2.510A449.70689.918%2706 RPM34.5 dB(A)45.67°C0.991
12.073V5.044V3.341V4.980V500.12855.86°C115.04V
1133.744A8.926A8.892A2.512A494.51789.481%3184 RPM38.7 dB(A)46.88°C0.992
12.070V5.043V3.341V4.978V552.65157.67°C115.04V
CL10.138A12.002A11.999A0.000A102.47686.890%742 RPM6.5 dB(A)42.21°C0.948
12.095V5.050V3.350V5.028V117.93848.51°C115.05V
CL237.509A1.002A1.001A1.000A466.10290.568%2648 RPM34.3 dB(A)45.90°C0.991
12.069V5.046V3.342V5.005V514.64255.83°C115.04V

The SF450 Platinum's load regulation is amazing on every rail. Great Wall's engineers did a superb job optimizing for this series of tests. Better still, the fan profile operates conservatively. We pushed the PSU hard to get its fan spinning at close to 3200 RPM, and it still didn't break the 40 dB(A) threshold. It is very hard to make such a tiny PSU quiet, but an efficient platform surely helps.

Speaking of efficiency, with 20% and 50% load, the SF450 lands close to the 80 PLUS Platinum specification's requirements. Under full load, it easily passes the 89% mark. Efficiency levels would be even higher at lower ambient temperatures.

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  • SR-71 Blackbird
    I run a SF600 Gold in one of my setups. To improve on that is awesome. Thanks for the review Aris!
  • Brian_R170
    Nice to see more quality PSUs available for small form-factor cases. The included ATX-to-SFX adapter is welcome addition, but I prefer the flat non-sleeved cables found on the SF450 Gold in small cases where space to bundle cables is limited.
  • TripleHeinz
    I've been running for 3 years in a row, almost every single day with the PC on, a FSP FSP300-60GHS-R SFX PSU in my custom-made mini ITX system. It is rated at 300W, 80 plus, 80mm fan with sensor, completely silent, comes with an ATX bracket+cable+screws, user manual plus nice box, a total marvell. I think it is a very respectable PSU (good internals) if you ignore the standard satin gray color.

    Well I'm here to say that the Corsair SFX PSU is very impressive but for that price you'll have to justify the buy with a very specific purpose of your own. I can only recommend the FSP SFX PSU, the 300W model (the 450W model is said to be loud), it is more than enough for HTPC and low power ITX parts (and midrange hardware as well: I5 + GTX1060).

    Disclaimer: I do not work for FSP ;p
  • jayjr1105
    Great review. Amazing these SFX's getting so good even with less room.

    May I suggest the latest Rosewill Capstone M lineup by Andyson for a future review. The previous Superflower and Enhance units were well reviewed but they switched to the Andyson GX platform. Thanks!