Seasonic X-Series 850W KM3 Power Supply Review

1. Introduction2. Seasonic X-Series 850W KM3 (Bundle & Cables)3. Seasonic X-Series 850W KM3 (External)4. Seasonic X-Series 850W KM3 (Internal)5. Seasonic X-Series 850W KM3 (Super High Res Gallery)6. Testing Methodology7. Closing Thoughts8. View All Pages

The Seasonic X-Series 850W KM3 is right up there in the top 3% of high power units available on the market today. It really is as close to perfect as you are likely to see and will appeal to the high end audience who don't mind paying a little extra for a top of the line supply.

Load regulation is class leading and we have yet to test a more capable unit in this regard. The intensive cross loading test barely phased the unit, with it holding onto nominal readings. Noise suppression is also close to perfect and reinforces the 850W KM3 standing as justifiably the finest power supply on the market today.

The addition of a new fan S2FC/S3FC selector switch and flat ribbon style modular cabling just enhances the overall appeal to the extremely demanding enthusiast audience.

The power supply is basically silent until just over 400W of output when the fan starts to spin up a little. Even at a 700W power demand the unit is whisper quiet. This is particularly appealing to gamers who have spent some time watercooling their system to reduce noise levels as much as possible.

The new KM3 is available in the United Kingdom for around the £150 inc vat mark. It is rather expensive, but when you consider the power characteristics and market leading design, we feel it is well worth the money.

Pros:

• load regulation.
• noise suppression.
• very quiet.
• 80 Plus Gold+ efficiency levels.
• can deliver over 1,000W output without falling over.
• pure modular design.
• fan switch.

Cons:

• Price premium.

Kitguru says: If you want the best, then the Seasonic X-Series 850W KM3 unit is exceptional value. It is simply flawless.

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