Corsair SF450 Platinum SFX PSU Review: Best of the Best

Protection Features and DC Power Sequencing

Protection Features

Check out our PSUs 101 article to learn more about PSU protection features. Our protection features evaluation methodology is described in detail here.

Protection Features
OCP12V: 50.6A (134.93%), 12.039V
5V: 26.1A (130.5%), 5.043V
3.3V: 27.7A (184.67%), 3.343V
5VSB: 3.4A (136%), 4.999V
OPP622.9W (138.42%)
OTP✓ (140°C @ Secondary side)
SCP12V: ✓
5V: ✓
3.3V: ✓
5VSB: ✓
-12V: ✓
PWR_OKAccurate (but lower than 16ms)
NLO
SIPSurge: MOV
Inrush: NTC thermistor & bypass relay

The OCP triggering points on every rail except for the 3.3V one are properly configured. Because of the 3.3V rail's low nominal capacity, OCP's percentage is too high. Ripple stays in control though, as does load regulation.

OPP is set at around 138.5%, which allows the PSU to deliver more than 620W of load before shutting down. We usually ask for 130% above the nominal capacity, but because this is a low-capacity and well-built power supply, we don't have a problem with its higher OPP. It'll have no problem coping with the power spikes that many high-end graphics cards generate.

Short circuit protection is present on all rails, as expected, and the power-good signal is accurate. However, it doesn't exceed 16ms as the ATX spec demands.

DC Power Sequencing

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 during power-up and normal operation.

For our first measurement, we turn the PSU off and switch it back on without load on any of its rails. In the second test, we set the PSU to standby mode, dial in a full load, and start the PSU. In the last test, with the PSU switched off, we dial in a full load before restoring power.

Since the 3.3V rail is lower than the other two rails in every case, we can say that everything went smoothly.

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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!