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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

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


X660 Gold (SS-660KM Active PFC)
X Series


ATX12V v2.3 / EPS 12V v2.91
Maximum Power
Main Connector
+12V Rails
PCI-Express Connector
4 x 6+2-Pin
SATA Power Connector
SLI Ready
CrossFire Ready
Full Modular
80 PLUS GOLD Certified
Over Voltage Protection
+3.3V@25A, +5V@25A, +12V1@54A, -12V@0.5A, +5VSB@3.0A
5.91" x 6.30" x 3.39"
7 lbs.


1 x Main connector (20+4Pin)
1 x 4+4 Pin ATX 12V/EPS 12V
5 x Peripheral
8 x SATA
2 x Floppy
4 x PCI-E
80 PLUS Gold Certified Super High Efficiency

Seasonic DC Connector Module with Integrated

Voltage Regulator Module

DC to DC Converter Design

Seasonic Hybrid silent Fan Control

Sanyo Denki - San Ace Silent Fan

Conductive Polymer Aluminum Solid Electrolytic Capacitors

High Reliability 105°C Grade A Capacitors

Tight Voltage Regulation [±3%]

Active Power Factor Correction [99% PF Typical]

High +12V Output

High Current Gold Plated Terminals

Dual Sided PCB Layout

Ultra Ventilation [Honeycomb Structure]

Full Modular Cabling Design

Multi-GPU Technologies Supported

All-in-One DC Cabling Design

Easy Swap Connector

Universal AC Input [Full Range]

Protection Features: OPP / OVP / UVPISCP / OCP / OTP

Manufacturer Warranty

5 years limited
5 years limited

Quick Info


  • Limited Warranty period (parts): 5 years
  • Limited Warranty period (labor): 5 years

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

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  • Karol C.
  • 4/7/2011 8:49:51 PM
  • Tech Level: High
  • 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.

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

  • Gevorg A.
  • 3/26/2011 11:28:21 PM
  • Tech Level: Somewhat High
  • 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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Computer Hardware > 
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SeaSonic USA > 
Item#: N82E16817151104
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