Seasonic X-Series 660W Power Supply Review

1. Introduction2. Seasonic X-Series 660W (Bundle & Cables)3. Seasonic X-Series 660W (External)4. Seasonic X-Series 660W (Internal)5. Seasonic X-Series 660W (Super High Res Gallery)6. Testing Methodology and Results7. Closing Thoughts8. View All Pages

We haven't been disappointed with the Seasonic X-Series 660W power supply, it is just as impressive as the higher output units which we have reviewed over the previous couple of months. A 660W unit will obviously sell more units than a 850W or 1250W unit due to the lower price point.

The X Series 660W is an attractive power supply, finished with deep black paint which proves resilient to scratching. It does attract finger prints, although they are easily removed with a cloth.

Impressively, Seasonic are clearly over specifying these units, as this unit was able to hold a 800W output without issue. Not often we see a unit holding a 150W above rated power level for a long period of time.

Technically there are no weaknesses with this design. It delivers high levels of efficiency while maintaining strong noise suppression. The +12V output peaks at 30mV under full load and +3.3V/+5V peak at 15 mV under the same conditions.

At the lower end of power delivery the fan doesn't spin at all, ideal for people who are running a media center in a living room or bedroom. Even when tasked above 500W when the fan spins up, it never becomes intrusive. Seasonic have opted for an expensive Sanyo Denki San Ace fan which is designed for long life and quiet operation.

The modular design is very impressive and will suit a wide audience who don't want to have to route a plethora of unnecessary cables. The dual pouch storage pouch is a worthy addition and ensures no cables will be lost over time.

We have no hesitation recommending this power supply, and like the others in the X-Series range it is built to the highest standards. This is an ideal choice for a gaming system or high grade media center when partnered with more demanding components.

Just before we published this article, Seasonic instructed us that this X-Series 660W unit is now discontinued. That said, there will be stock of this unit in the channel, so the results are still useful. The company are updating this range with a new 650W model which Kitguru will be reviewing as soon as possible.

Pros:

• Excellent build quality.
• Modular design.
• quiet, quality fan.
• efficient.
• stable load regulation.
• can deliver over 1,000Watts!

Cons:

• There is a price premium with this design.

Kitguru says: No weaknesses in this X-Series range. The 660W joins the X-Series 850W and 1250W as another ‘must have' design.

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