Corsair SF450 Platinum SFX PSU Review: Best of the Best

Performance, Value, Noise and Efficiency

Performance Rating

The following graph shows the SF450’s total performance rating, comparing it to other PSUs we have tested. To be more specific, the tested unit is shown as 100 percent, and every other unit's performance is shown relative to it.

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The SF450 Platinum's overall performance is a tad lower than its big brother. However, the Platinum-rated version is quite a bit better than the SF450 Gold. Corsair's latest is now the best 450W SFX-based power supply available.

Performance Per Dollar & Pound

The following chart may be the most interesting to many of you because it depicts the product’s performance-per-dollar score. We looked up the current price of each PSU on popular online shops and used those prices and all relative performance numbers to calculate the index. Note that all of the numbers in the following graph are normalized by the rated power of each PSU.  

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The prices of both SF Platinum models are high. This hurts their value scores.

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Noise Rating

The graph below depicts the cooling fan's average noise over the PSU's operating range, with an ambient temperature between 30°C and 32°C (86°F to 89.6°F).

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If you want an especially quiet SFX-based power supply, then both of Corsair's Platinum-rated SF models are ideal. The company's 80 PLUS Gold SF450 is in that same category as well.

Efficiency Rating

The following graph shows the PSU's average efficiency throughout its operating range, with an ambient temperature close to 30°C.

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Every PSU with an overall efficiency score over 91% is a strong candidate for the highly prestigious Cybenetics ETA-A+ badge. Its requirements are difficult to satisfy, even for 80 PLUS Titanium-certified power supplies. That alone shows how efficient this new platform is, especially in its 450W flavor.

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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!