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Seasonic X-Series 1250W Power Supply (SS-1250XM2)

There is no doubt that the Seasonic X-Series 1250W is a monster power supply designed to deal with expensive, high drain Crossfire and Sli system builds. This 2014 version builds on the strengths of the older model, tweaks the appearance a little and adds a couple of new features into the mix.

While the chassis has been redesigned a little, the new version looks very similar, with some artwork changes on the side panels. The fan controller has been upgraded with a new multi loop IC control incorporating Hysteresis to help prolong fan life. Dual copper bars are included with an reported extra 40% trace capacity which help it to handle higher current more efficiently.

Technically there is still little to fault with the core Seasonic design. It combines very high levels of efficiency with rock solid voltage regulation. It excelled with the intensive cross load test and handled a steady 96 amps via the +12V without a problem.

Ripple suppression is very good and +3.3V, +5V and +12V rails all fall well within the rated industry tolerance specifications. +12V peaks at 40mV and the +3.3V and +5V ripple results were just as positive, peaking at 15mV and 20mV respectively.

We tested the Seasonic X-Series 1250W with three Nvidia GTX Titan graphics cards, and a high end 4770k system, overclocked to 4.5ghz. It ran cool and stable showing the potential for ultra high end system builds. The pure modular design is also ideal for a high profile windowed system build – to help maintain a clean, tidy appearance.

You will be able to pick up the new SS-1250XM2 model in the United Kingdom very soon, at a price around £250 inc vat. This power supply deserves to be in the final shortlist for a new high end system build. It is an exceptional design and one that will cope extremely well with demanding graphics cards.

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  • Quiet.
  • rock solid.
  • fully modular.
  • Monster +12V output.
  • built for demanding high end Crossfire and SLi systems.
  • delivered 1350Watts+ before shutting down.


  • The gold coloured fan grill may not be to everyone's taste.

Kiguru says: Another top grade, high end power supply from Seasonic. Considering the feature list and immense power output, it is reasonably well priced.

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Rating: 9.0.

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