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Seasonic Platinum 1200W Modular Power Supply Review

The Seasonic Platinum 1200W Modular Power Supply is an extremely impressive flagship model that will target the discerning audience who are powering expensive Crossfire and SLi systems with two or more graphics cards.

The Seasonic Platinum 1200W power supply is attractively finished and the paintwork passed our screwdriver test with flying colours. We are rather fond of the elegant grey/silver and black two tone finish.

Regular readers will be aware that we have already reviewed a power supply featuring the Seasonic XP3 design – the Cooler Master V1200 Platinum (back on May 6th). While inherently both power supplies will deliver almost identical results, the Seasonic unit features higher grade Nippon Chemi Con capacitors in the primary stage. Seasonic have adopted a triple 390uF 420V capacitor configuration, while the Cooler Master unit includes a single 390uf 420V capacitor with two lesser 330uF 420V capacitors.

The Seasonic power supply could deliver 1345watts before safely shutting down and it can happily run at 1,300 watts all day without a problem. Seasonic have earned a reputation for seriously over specifying their power supplies, and this unit is no exception.

There are some other differences between both XP3 designs. Cooler Master have opted to put the hybrid fan controller switch on an external expansion slot bracket, whereas Seasonic have the switch on the back of the power supply itself. I always feel a extra cable running from the power supply adds to potential ‘build clutter', although it is a very minor point.

Technically, the 1200W Platinum power supply is superb. Load regulation is rock solid and the unit coped very well with our stressful cross loading test. Ripple suppression may not quite match the incredible results we got from the Flextronics powered Corsair AX1500i Titanium, but they still fall well within rated industry specifications.

Noise levels of this power supply are low thanks to the adoption of the high grade Sanyo Denki fan. Seasonic select these fans specifically for their low noise and long life characteristics.

The Seasonic Platinum 1200W Modular Power Supply is available in the United Kingdom from Overclockers UK now for £250 inc vat.

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  • built to very high standards.
  • 80 Plus Platinum.
  • Pure Modular.
  • low noise levels under load.
  • high grade fan.
  • 10 PCIe connectors.
  • 7 year warranty.


  • Ripple suppression could be better.

Kitguru says: Another very powerful, over specified, efficient, high grade power supply from the Seasonic team.

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Rating: 9.5.

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