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SeaSonic USA > 
Item#: N82E16817151104

SeaSonic X660 (SS-660KM) 660W ATX12V V2.3/EPS 12V V2.91, 80Plus Gold Certified, Active PFC Power Supply

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  • ATX12V v2.3 / EPS 12V v2.91
  • 80 PLUS GOLD Certified
  • 4 x 6+2 Pin PCI-E

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

The very first full modular multi-output ATX, high-wattage power supply that has ever obtained the 80PLUS Gold certification is introduced by Seasonic. This coveted power supply is named “X” and rated from 560W to 850W.

Featuring an exclusive design of “DC Connector Module with Integrated VRM”, the X Series is set to achieve both near-perfect DC to DC conversion and fully modularized design without compromising efficiency. After a long wait, finally there is a product that delivers the complete package, ultra-high efficiency, greatly improved dynamic response, and customizable cable arrangement that is tailored to meet any individual’s needs.

  • newegg 80 PLUS Gold Certified The 80 PLUS Gold certified power supply provides high power efficiency of at least 87% at any load between 20% and 100%, saving your money on your electrical bill, reducing heat in your computer's system and prolonging its life.
  • newegg 660W Continuous Power with Ample +12V Output The Seasonic X Series X-660 delivers 660W of reliable, continuous output to run most systems on the market today. Single strong +12V rail providing up to 54A ensures better graphics card compatibility and maximum provision of 12V power to multi-core CPUs and energy-hungry graphics cards, minimizing the likelihood of overload.
  • newegg Full Modular Cabling Design The modular cabling design allows use of only the cables you need resulting in improved internal airflow and reduced system clutter. Easy Swap connectors allows for easy, quick and safe unplugging. High current gold-plated terminals ensure optimal signal transfer and stability of connected device.
  • newegg Hybrid Silent Fan Control & Sanyo Denki San Ace Silent Fan The Seasonic X Series adopts a clever “Hybrid Silent Fan Control” design, which offers three distinct operation modes, fanless mode, silent mode, and cooling mode. The X automatically adjusts fan mode and speed according to the ambient temperature level, which not only optimizes heat dissipation, but also prolongs lifespan of the system by reducing unnecessary fan rotation. To make the X Series even more robust and exciting, Seasonic offers Sanyo Denki San Ace Silent Fan on X, the best fan in the industry, to ensure ultra low noise performance and quality.
  • newegg Seasonic Design The Seasonic X Series features DC Connector Module with Integrated VRM (Voltage Regulator Module) and DC to DC Converter design to achieve lower current, lower loss and higher efficiency for total reliability and better security. All-in-one DC cabling design supports PC, IPC, workstation and server systems.
  • newegg Multi-GPU Ready Coming with 4x PCI-E 6/8-pin connectors, the SeaSonic X series X-660 allows you to build up a SLI or CrossFireX gaming system.

Learn more about the SeaSonic USA X660 Gold (SS-660KM Active PFC)

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 5 years
  • Limited Warranty period (labor): 5 years
  • Read full details

Customer Reviews of the SeaSonic USA X660 Gold (SS-660KM Active PFC)

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  • Andrew P.
  • 2/6/2015 3:31:57 PM
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsSuper Efficient = Silent

Pros: Fantastic power supply. If its connections and power are sufficient for you, look no further. I believe this item is being discontinued by Newegg but if you happen to be buying this from somewhere else, or its successor from Newegg, you're in for a good PSU.

A lot of power supplies these days have fans that are controlled by the loading condition, or better yet, the thermal condition. My Corsair PSU is definitely load-based and no amount of raising the case or adding an extra intake/exhaust fan is going to reduce the spin, even if the PSU is nowhere near overheating.

I believe this PSU is heat-based. I have it in a very circulated area and the room it is in is quite cool. With my overclocked i7-5930K and overclocked GPU (an old 660 Ti for the time being) both at 100% load, the PSU fan does not even spin.

300W for the computer at 75% efficiency means 400W from the wall, and 100W of waste is not only expensive, but it requires active cooling. At 85% efficiency, it's only 50W, which does not require active cooling.

Cables are sturdy and plenty long enough. PSU is nice and heavy, small and looks good.

Cons: Nothing at all.

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  • John S.
  • 1/31/2015 7:01:06 PM
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsGreat Power Supply

Pros: Silent and has all the power I need for my systems needs. Full modular is a plus compared to my old Corsair HX 620

Cons: None

Other Thoughts: After I did some resource online and finding out SeaSonic makes power supply's for most major brands I decided to just buy there's and got it on sale. Plus it was time for a little preventive maintenance.

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  • Matthew B.
  • 11/2/2014 9:25:29 AM
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsSolid power supply

Pros: It's quiet, the modular design is easy to work with and it provides what it is rated for. I purchased this psu because I upgraded to a GTX 780 and it's quite a bit more power hungry than my old GTX 670. I've had the psu installed for about a month and there have been no problems with it what so ever.

Cons: One reason I bought this psu specifically over some others is because it has bundled cables over flat cables. This is because I wanted to custom sleeve my cables. Unfortunately, however, the cables are glued together at the ends in addition to being heat shrinked together. This is going to make separating the cables quite difficult but hopefully not impossible. -1 Egg for the glue

Other Thoughts: Thanks again Newegg for a great product and great service.

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  • Karol C.
  • 4/7/2011 8:49:51 PM
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsJust PERFECT

Pros: Finally the power supply I can't hear!

Cons: none, except I can't hear if my computer is on...

Other Thoughts: My C2D@3.2Ghz/4GB/ATI4850 draws 120 - 220W from the wall, and the unit is always cool. I can't hear the fan, but I know it is running from time to time (I was checking). I use passive water cooling and SSD. With this power supply my computer is finally noiseless, and I still have space for i7 upgrade.

3 out of 3 people found this review helpful. Did you? Yes No

  • Gevorg A.
  • 3/26/2011 11:28:21 PM
  • Ownership: 1 week to 1 month

5 out of 5 eggsSuperb Quality.

Pros: Quite

Cons: Not 80 Plus Platinum or better

Other Thoughts: Upgraded from Corsair 620HX

2 out of 2 people found this review helpful. Did you? Yes No

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Item#: N82E16817151104
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