Reviews - Seasonic X-750 750W
Sample Provided by: (By OklahomaWolf on Sat, Jul-10-2010)

Page 1 -

With all these new 80 Plus Gold units coming down the pipe in recent weeks, I thought it might not be a half bad idea to take another look at one of the first Gold units to hit the market. A while back, I reviewed the Seasonic SS-650KM, also known as the X-650. And it was a most excellent unit indeed. But that was the baby of the X series family at the time, the lowest powered unit in the line, and up until now the 750 watt version has gone overlooked at this website.

I'm changing that today. We're going to have us a good long look at the X-750, and see if it's as good as little brother is.

As is often the case, we'll start with box pictures again. I suppose you could say I've gotten predictable in this way, starting out with box pictures every time, but what else am I going to start out with? Pictures of cats and pipe organs and the road construction people making all that noise outside my house right now? Of course I'm going to start with the box.

As is often the case with these power supply boxes, stuff is printed on this one. This part of the box has marketing in six different languages, none English. This is because, like the X-650, all the English marketing is on the back of the box.

This is pretty much identical to the X-650 box, so I'll just go ahead and paste in the details from that review. Let's see... here we go... no, wait, I'm getting glue all over my monitor and the paper keeps sliding off. Let's try the Windows method instead.

  • 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
    • 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.
  • 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
  • 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.
    • 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

With the marketing out of the way, we can open up the box and start unpacking. We can't get to the meat and potatoes of this review without opening the fridge first, can we?

The box was hiding a power supply in a little black bag, a bag of modular cables, a manual, a little bag with a case badge and screws in it, a little flyer with the five year warranty details on it, and a power cord. There were no actual meat and potatoes, sadly.

Here is the user guide. It's every bit as well done as the one that came with the X-650. It should be - it's totally identical.

This somewhat blurry picture was provided by Mr. Fuji, who seems to be off his game a little bit today. Between you and me, I think Mr. Fuji has a hangover. What happened, did you drink a little too much sake last night, Mr. Fuji? Japanese is a cool language, but I don't speak it... can you repeat that in English, Mr. Fuji? You say I don't want to know? Tell me anyway, I...

Folks, I didn't want to know.

Now that Mr. Fuji's exploits are now stuck in my head never to leave it, let's have a look at the X-750 from this angle. As was the case with little brother, the color scheme is a simple matte black and gold affair that pleases me.

Go for Gold! Um... if you can see this part of the power supply, haven't you technically already gone for Gold? Well, I have... that's how come I can have Mr. Fuji show this to you.

Here's the exhaust grille for the X-750. Nice and open, good for letting out the hot air. That gives me an idea... let's send a grille like this to every politician in Canada. It'll make them more efficient, too.

Like little brother, the X-750 features the same little label telling you that the fan turns off when the unit is cool, just in case you were to fire it up and panic because the fan's not running.

And here's our label with the load table on it. This unit has a single 12V rail, with a total capacity of 744 watts. Like the X-650, this unit uses the voltage regulator module approach for the minor rails, which sees the 3.3V and 5V rails powered off the one big 12V rail.

Seasonic SS-750KM

+3.3V +5V +12V -12V +5VSB
25A 25A


1A 3A
Max Power 125W 744W 12W 15W

Another most excellent thing the X-750 boasts is full modularity. While the approach Seasonic used here isn't quite as intuitive as some others I've looked at, Seasonic has thoughtfully provided a label so you can tell which wires go where. I will admit, however, that the gold lettering on this label is hard to see. This might give you trouble if you're, say, Batman trying to install this without a flashlight way back in the Bat Cave somewhere. I'd like to see this made a little bit more readable, but it's not a big problem for most of us. At least the appearance is consistent with the rest of the unit.

Just send Batman a special one with a label more readable in dim light, is all I ask. The man just doesn't have the time to run all over looking for a flashlight. He's got until the Joker puts his makeup on, and that's it - he has to be out the door fighting crime. He'd be the laughingstock of the superhero world if Spiderman or Superman got there first.

If the above picture is familiar to you, it's because you've looked at the X-650 review and seen it all before. Seriously, the cabling is pretty much identical.

Type of connector: Seasonic SS-750KM
Modular Cables
ATX connector (570mm) 20+4 pin
4+4 pin ATX12V/EPS12V (580mm) 1
8 pin EPS12V (580mm) 2
6+2 pin PCIe (580mm) 4
SATA (350mm+150mm) 2
SATA (450mm+150mm+150mm) 3
SATA (550mm+150mm+150mm) 3
5.25" Drive (350mm+150mm) 2
5.25" Drive (450mm+150mm+150mm) 3
5.25" Drive (550mm+150mm+150mm) 3
5.25" to Dual 3.5" Adapter (+150mm) 1
Unit Dimensions(L x W x H)
160mm x 150mm x 85mm


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