Corsair SF450 Platinum SFX PSU Review: Best of the Best

Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the SF450’s rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V, and 5VSB).

Test12V5V3.3V5VSBPass/Fail
10% Load5.5mV6.8mV4.5mV7.6mVPass
20% Load8.5mV7.2mV5.3mV9.2mVPass
30% Load11.0mV7.6mV5.6mV9.0mVPass
40% Load12.7mV7.9mV6.2mV8.6mVPass
50% Load15.2mV8.7mV6.8mV8.7mVPass
60% Load26.5mV9.4mV8.7mV11.3mVPass
70% Load18.9mV10.2mV10.2mV10.2mVPass
80% Load19.9mV11.0mV11.7mV11.2mVPass
90% Load21.7mV11.3mV11.1mV12.5mVPass
100% Load23.3mV12.0mV11.1mV13.6mVPass
110% Load25.8mV12.1mV10.9mV14.7mVPass
Cross-Load 19.9mV11.6mV11.2mV15.6mVPass
Cross-Load 223.6mV8.1mV6.8mV15.0mVPass

Ripple suppression is great on every rail, despite the lack of in-cable capacitors. Plenty of polymer caps on the secondary side, along with a few electrolytic ones, enable clean DC rails.

Ripple Oscilloscope Screenshots

The following oscilloscope screenshots illustrate the AC 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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  • 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!