Introduction

We would like to thank Seasonic for supplying the review sample.


Seasonic recently released an SFX PSU with 750 W maximum power output in an attempt to dethrone the mighty Corsair SF750 Platinum, which is the best currently available SFX PSU offering. A significant advantage the SPX-750 has over the SF750 is the long 10-year warranty, as the Corsair offers 7 years for its flagship SFX offering. In my opinion, anything above five years is unreasonable when it comes to power supplies, which are highly dependent on the quality of the mains grid, and external factors can affect the latter (e.g., thunderbolts). If a power surge or brownout damages your PSU, the warranty won't cover it, which is reasonable because PSU manufacturers are not responsible for the power grid's quality.

The SPX-750 uses a fully modular cable design with enough EPS and PCIe connectors to support a potent gaming system. It is 80 PLUS and Cybenetics Platinum certified for efficiency and Cybenetics Standard+ certified for noise output. The cooling fan measures 92 mm across and uses a fluid dynamic bearing. It also has a semi-passive operation. With a street price of $190 to $200, it isn't affordable, so it will have to deliver top performance and reliability to justify its high price tag. As this is written, the Corsair SF750 is slightly more affordable as this is written.

This is the first desktop PSU with fan failure protection I have come across. In other words, if the fan has a problem or the PSU doesn't detect it, which would happen if it isn't connected, the SPX-750 won't start.

Specifications