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Seasonic X-Series 650W KM3 Power Supply Review

Rating: 9.5.

Seasonic really need no introduction, they have been releasing multiple series of class leading power supplies in 2012. They recently launched the latest X-Series KM3 range, superseding the award winning KM2 units which we reviewed last year. Today we are looking at the X-Series KM3 650W power supply, a very popular wattage capacity with the enthusiast audience.

The X-Series 650W KM3 is not just a simple refresh however as the internal design has been changed and we will take a look at this later in the review. The KM2 was already a very impressive unit, so we are interested to see just how far further the company can push the new design.

They have three models already in the KM3 range, a 650W, 750W and 850W model all with a single +12V rail, fan controller and new modular cabling.

Special Features –

  • 80PLUS® Gold Certified Super High Efficiency
  • Full Modular Cabling Design
  • Patented DC Connector Module with Integrated VRM [Voltage Regulator Module]
  • DC to DC Converter Design
  • Seasonic Hybrid Silent Fan Control
  • Sanyo Denki San Ace Silent Fan
  • Conductive Polymer Aluminum Solid Capacitors
  • Highly Reliable 105℃ Japanese Brand Capacitors
  • Tight Voltage Regulation [±1%]
  • Active Power Factor Correction [99% PF Typical]
  • High +12V Output
  • High Current Gold Plated Terminals
  • Dual Sided PCB Layout
  • Ultra Ventilation [Honeycomb Structure]
  • Multi-GPU Technologies Supported
  • All-in-One DC Cabling Design
  • Easy Swap Connector
  • Universal AC Input [Full Range]
  • 7 Years Warranty

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  • Black Mamba

    Excellent, as we would expect by now !

  • harris

    My only problem with Seasonic is the pricing, they may be great, but I can’t afford the products of theirs I want to buy, I have to get cheaper.

  • Alex

    I have their last 650W PSU and I am happy with it. I always thought ribbon cabling was worse than the fat sleeved cabling, but I was clearly wrong.

  • Stevie

    Great company, always buy their products, and they last many many years, never had a seasonic fail. wise to see corsair and other companies using their designs.

  • Ivan

    Just ordered one as I needed a new 650w, my thermaltake 750w died and it was noisy too.

    THanks for review

  • Darth Digglers

    Bah! Newegg dont list these as KM2 or KM3, what a mess. they needed to change the name to R2 or something so retailers would list them properly. they are all falling under the X series name, which is a mess.

  • djoCC22

    i 1 it!!! great product but not great price for me.. i need titanium cert…..