Seasonic X-Series 1250W Power Supply Review

1. Introduction2. Seasonic X-Series 1250W (Bundle & Cables)3. Seasonic X-Series 1250W (External) 4. Seasonic X-Series 1250W (Internal)5. Seasonic X-Series 1250W (Super High Gallery)6. Testing Methodology & Results7. Closing Thoughts8. View All Pages

The Seasonic X-Series 1250W power supply really is a great design, our view on it hasn't changed since we reviewed the XFX Pro 1250W Black Edition last November. The overall design is rock solid, well built and exhibits no discernible weaknesses.

This year it faces some serious competition however from new 80 Plus Platinum certified products – such as the Corsair Professional Series AX1200i.

We also rate the BeQuiet! Dark Power Pro 10 1200W highly, another top award winner on Kitguru, and another Seasonic OEM design.

Technically, the DC to DC Seasonic design is exemplary, combining very high levels of efficiency with rock solid voltage regulation. We cross loaded the power supply quickly with 95A on the +12V output and it held steady, only dipping a little to 11.93V. A lesser design would find this a real problem to handle and we have even experienced several failures with other units when pushing this hard.

Noise suppression is decent and none of the results cause concern and are well within rated industry tolerance levels. +12V peaks at 45mV and the +3.3V and +5V ripple results were just as positive, peaking at 15 mV and 25 mV respectively.

As always, we put the Seasonic X-Series 1250W through some ‘real world' paces. We used it in a system with a liquid cooled Core i7 3960x Extreme Edition processor overclocked to 4.8ghz, paired up with 32GB of ram, and two Nvidia GTX590′s in Quad Sli.

The total system drain was 930 Watts at the socket and this power supply handled the load without a hitch, or by generating high levels of noise from an overactive fan. Generally the power supply is basically silent, unless pushed very hard (1000 watts+ and it becomes audible).

In the United Kingdom, you can pick up the Seasonic X-Series 1250W for £213 from ARIA, having just received some aggressive price reductions today. If you want an 80 Plus Platinum Certified unit close to the same capacity, and don't mind spending extra, then we can also recommend the Corsair Professional Series AX1200i, although at £262.94 inc vat, it is very expensive.

Pros:

• Quiet.
• Immensely powerful.
• Fabulous appearance.
• very efficient.
• Fully modular.
• rock solid.
• Recent price drops.
• 8 PCI-E 6+2 cables for ultimate Crossfire and SLI system builds.

Cons:

• None.

Kitguru says: Another award winner for XFX. A class leading Seasonic design. Rock Solid.

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