Reviews - Seasonic X-650 650W
Sample Provided by: (By OklahomaWolf on Sun, Oct-11-2009)

Page 1 -

It is time once again to explore the strange and exciting world of power supplies here at, and for only the second time ever I've decided to go digging for 80 Plus Gold again. You'll remember that a couple weeks ago I took a look at the OCZ Z series at 850 watts. That unit was the first unit in my lab to clear Gold, but in ways other than pure efficiency I found the performance a bit lacking in that unit. We'll see if today's outing with the brand new Seasonic X series at 650 watts delivers the goods in both efficiency and performance.

But first, let's look at the box some more and find some marketing to talk about. Wait... none of these panels are in English, here. Let me spin the box around some more.

Oh, here's something. Two small tables with specifications and load ratings for the unit. Single 54A 12V rail, eh? Internet, eh? Maude, eh? Sorry... I should turn the TV off while I'm writing.

Uh... guys? I think I found the English marketing section. It takes up the whole back of the box. Man... it's like they took a bazooka with some ink in it and went blasting away at the box. Let me see if I can organize this in a way that won't destroy the remains of my sanity.

  • Seasonic Patented DC Connector Module with Integrated VRM * [Voltage Regulator Module]
    This patented full modular design minimizes voltage drop and impedance, maximizes efficiency and enhances the overall performance for cooling and reliability. *Patent Pending: US, CN, JP, TW & DE
    -Impedance? I think the word you want there is "resistance," Seasonic. Impedance is a function of AC power, not DC.
    • Benefits:
      • Minimizes resistance and voltage drop to maximize efficiency.
      • Consolidates and minimizes component useage to create space to improve airflow for better heat dissipation & cooling.
      • Extensive use of Al & SMD automation reduces human error and improves reliability.
      • Simple & ingenious design for a clean layout achieves unsurpassed quality and performance.
  • 80 Plus® Gold Certified
    At least 87%, 90%, 87% efficient at 20%, 50% and 100% operating loads, respectively.
    -We'll have to see in the load testing part of the review how well this unit does in meeting these targets.
  • Seasonic Patented "Hybrid Silent Fan Control" *
    An industry first, advanced 3 phased (Fanless, Silent, and Cooling Mode.) thermal control balances between silence and cooling. *Patent Pending: US, CN, JP, TW & DE
    -I'm not sure about this one. We've seen fanless before, and we've seen operation that ramps up the fan according to temperature before too. What's new and different here, exactly, that needs patenting?
  • Sanyo Denki - San Ace PWM Silent Fan
    The superb high-grade San Ace Pulse Width Modulation fan pairs perfectly with the Hybrid Silent Fan control circuit for super low noise & cooling performance.
    -Interesting... I'm not sure fanless operation has been done with a PWM fan before. Maybe that's what they're patenting.
    • Benefits:
      • Reduces noise without increase in temperature.
      • Extends fan life by eliminating unnecessary rotation.
      • Optimizes heat dissipation at all times.
      • Fanless mode (0 dBA) provides unsurpassed silent performance.
  • Active Power Factor Correction [99% PF Typical]
    Reduces line loss and power distortion.
  • Highly Reliable 105°C Japanese Brand Capacitors
    Exceptionally reliable components extend product life.
  • Conductive Polymer Aluminum Solid Capacitors
    Enhanced stability at severe operating conditions.
  • Tight Voltage Regulation [±3%]
  • High +12V Output
  • Dual Sided PCB Layout
  • 5 Years Warranty
  • Full Modular Cabling
  • Universal AC Input [Full Range]
  • Multi-GPU Technologies Supported
  • Patented Easy Swap Connector
  • All-in-One DC Cabling Design

Whew, I think I'll stop there. I think I covered most of the salient points up there, anyway, though there are a couple of graphs and fancy pictures on the back of the box too I haven't mentioned.

Ah, at last it's time to unpack.

We get a power supply enclosed by a velvet bag, a user guide, a power cord, some screws, a case badge, and a folding double sectioned bag full of modular cables.

The user guide is well done on this unit, and is reprinted in a bunch of different languages.

And here's the unit itself, sans velvet bag. It's done up in a rough matte black finish.

These things are so much easier to photograph when they have no cables coming out of them. Here you can see the modular cable connectors. Let me get a better picture of those for you.

The modular cable connectors are all Mini-Fit Jr. style, and all are different from one another to reduce the chances of plugging something in where you shouldn't. Sharp eyes will notice that the ATX cable actually gets two connectors, rather than one single 24 pin monster. I presume this was done so the two rows of connectors could remain the same width.

Go for Gold! This is the sticker you'll be looking at should your case happen to have a window where the power supply goes.

A peek through the exhaust grill shows an interesting lack of heatsink material inside. I'm looking forward to taking this one apart on page four.

The fan side of the unit once again declares that the fan only runs when needed.

And here's our load table label for the day. As you can see, the unit promises that all but two watts of its total power output can be had solely on the 12V rail if needed. That's going to be tricky to test for in my crossload testing - it will require dropping most of the other rails to a zero load condition. Not all units like that. We'll have to see if this is one of those units.

Seasonic SS-650KM

+3.3V +5V +12V -12V +5VSB
25A 25A 54A 1A 3A
Max Power 125W 648W 12W 15W

An array of modular cables poses beneath the modular cable bag. Should you happen to have something that needs a 3.5" drive connector, Seasonic has provided a 5.25" connector adapter for you. Otherwise, Seasonic went with their usual differing length cable chains to assist in cable management. There are two total PCI-E chains, each splitting off into two cables at the modular panel connector.

Type of connector:
Seasonic SS-650KM
Modular Cables
ATX connector (560mm)
20+4 pin
4 pin ATX12V connector (570mm)
8 pin EPS12V connector (570mm)
SATA (350mm+150mm)
SATA (440mm+150mm+150mm)
SATA (540mm+150mm+150mm)
5.25" Drive (350mm+150mm)
5.25" Drive (440mm+150mm+150mm)
5.25" Drive (540mm+150mm+150mm)
3.5" Drive (150mm 5.25-3.5" adaptor)
6+2 PCIe (580mm)
Unit Dimensions(L x W x H)
160mm x 150mm x 86mm


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