Posted On: Fri, Nov-18-2011
Reviewer: OklahomaWolf
Product: Seasonic Platinum 1000W
Product Link:
Supplied By: Seasonic
Price: $264.99 @ FrozenCPU


It seems an eternity since we heard rumblings of something new and awesome from Seasonic. A while ago, they were rumored to be working on some higher powered variants of their X series units that would clear the 80 Plus Platinum certification level as well. Folks, the rumors are now fact - the new Platinum models have landed. I've got the 1kW model on my bench. Let's take a good, hard, look at what it can do.

Page 1 - First Look

My... precioussssssssssssssssssssss....

Sorry, I seem to have gone all Gollum on you for a moment there. But look at the above picture, can you blame me? My readers and I have been waiting for this day a long time now. Ever since Seasonic announced that they were working on a new line of awesomeness at the 80 Plus Platinum certification level, yours truly and everyone else has been drooling lakes and rivers waiting for those mythical units.

Well, drool no more. The day is finally here. Today I have a Seasonic Platinum 1000 on my hands, and it's going to get tested.

Naturally, this review starts up with some box pictures. And this one is crammed full of marketing to talk about. Let's get this over with, shall we?

  • Ultra High Efficiency, 80 PLUS® Platinum Certified (
    Sea Sonic's corporate slogan "Green Innovation Powers Your Life" defines our commitment to the design and production of the most eco-friendly power supply units on the market today. The 80 PLUS® Platinum certification defines efficiency rating of greater than 90%, 92%, 89% efficient at 20%, 50% and 100% operating loads, respectively. The Sea Sonic Platinum Series represents the highest level of technology and efficiency achieved by Sea Sonic to date through 35 years of commitment to engineering excellence.
    -This stands in contrast with my own corporate slogan: "Insanity Defines Progress."
  • Seasonic Patented DC Connector Panel with Integrated Voltage Regulation Module*
    Seasonic's patented full modular design minimizes voltage drops and impedance, maximizes efficiency and cooling, enhances overall performance and reliability.
    *Patent Pending: US, CN, JP, TW, & DE
    -Again, impedance is a function of AC power. Since we're talking about DC here, the correct term is resistance. DC knows all about resistance. But enough about congress. Badumbum-tssh.
    • Minimizes line resistance and voltage drops to maximize efficiency.
    • Reduces overall component count to better space utilization for optimal airflow, heat dissipation and cooling.
    • Extensive use of SMD technology for overall quality and reliability improvement.
      -Hmm... either they're talking about surface mount devices or sugary microscopic donuts. Either way, it's all good.
    • Simple and ingenious design for a "clean" layout to achieve unsurpassed quality and performance.
  • Tight Voltage Regulation [± 2%]
    Improves load regulation and reduces voltage variations to provide smooth and stable operations.
    -Hear that? Our triple bypasses from eating all those little donuts will go a little more smoothly now.
  • Seasonic Hybrid Silent Fan Control - S²FC & S³FC*
    An industry first, advanced 3 phased thermal control balances between silence and cooling. The Hybrid Silent Fan Control provides 3 operational stages: Fanless, Silent, and Cooling Mode. In addition, a selector switch is provided to allow you to select between the Seasonic S²FC fan control, without fanless mode or the S³FC fan control, with fanless mode.
    *Patent Pending: US, CN, JP, TW, & DE
    • 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.
  • Sanyo Denki - San Ace Silent Fan
    The world-reknowned Sanyo Denki ball bearing fans are made of the highest quality components to ensure maximum quality and performance. The use of spoon shaped high-density plastic fan blades with smooth leading edges, strict tolerance ball bearings and precision copper axel are just some features to ensure ultra low noise performance and quality. In addition, the fan uses 3 balancing points, instead of the industry standard of 2 points, to ensure perfect balance and rotation. The Sanyo Denki fan is a perfect match to the class leading Sea Sonic Hybrid Silent Fan control for the absolute top performance of the industry.
    -So... you're saying this unit has a fan for cooling, then? Sounds crazy enough to work.

Ok, enough smart alecky comments. Here's the side of the box with a load table and some other useful specs.

Hooray! Unpacking time!

Lots of goodies come with one of these. A power cord, user guide, velcro cable ties, zip ties, screws, a case badge, and a bag of modular cables. Not to mention the power supply itself, nestled in a velvet bag.

Here's the user guide. Not too useful, as most of it is crammed full of marketing, but it has all the basics.

The power supply itself is done in a rather lovely two tone matte gray. One of the better looking ones I've seen in quite a while, I have to say.

A look from this angle shows us a blue sticker intended to be removed before operation. It tells you what the fan control switch does. The same info is printed on the casing underneath, so I'm not sure exactly what purpose the sticker serves. Perhaps it's just a reminder that this unit does have a fanless mode, depending how you set the switch.

Nice, big power switch on this beast. I like it. The smaller ones can sometimes fail, and don't usually handle as much power.

A look at one of the sides.

The view from the top. That's a 120mm fan, by the way.

The label. As you can see, thanks to the VRM approach again, this bad boy can push up to 83A through the single 12V rail alone. Nice.

Seasonic SS-1000XP

+3.3V +5V +12V -12V +5VSB
25A 25A 83A 0.5A 3A
Max Power
125W 996W 6W 15W

There's that blue sticker again. It's actually blocking a couple modular connectors, so you should indeed remove it before use.

For load testing, I've decided to go with normal mode. Fanless modes don't usually last long in the hot box, anyway.

Since this unit is fully modular, there are a lot of cables that can be jacked in. Here's a table:

Type of connector: Seasonic
Modular Cables
ATX connector (590mm) 20+4 pin
4+4 pin EPS12V/ATX12V connector (650mm) 1
8 pin EPS12V connector (650mm) 1
6+2 pin PCIe (600mm) 6
5.25" Drive (550mm+150mm+150mm) 6
5.25" Drive (350mm+150mm) 2
5.25" - Dual 3.5" Drive (140mm) 1
SATA (530mm+150mm+150mm) 9
SATA (350mm+150mm) 2
Unit Dimensions (L x W x H)
190mm x 150mm x 86mm


Page 2 - Cold Testing

Now, I'm anxious like never before to get the load testing going, so I'm going to keep this short.

  • SunMoon SM-268
  • Rek RF9901
  • Tektronix TDS-2012B
  • Multimeter
  • Dual probe thermometer
  • Two auxiliary 12V electronic loads
Results from Seasonic SS-1000XP
STANDBY load tests
Test # +5VSB DC Watts/
AC Watts
P.F. Eff.
1 0.5A 2.55W/
0.378 79.4%
2 1.5A 7.61W/
0.514 77.7%
3 3A 15.1W/
0.574 77.8%

Well, now. Looks like the efficiency boost starts early, because this is one of the more efficient standby stages I've seen in a power supply lately. Not under 77%. Excellent. I don't really grade on this section, rather include it for curiosity's sake, but if I did this model would already get a platinum star from a platinum blonde. Who may or may not have done some crying over you.

Results from Seasonic SS-1000XP low load test
+3.3V +5V +12V 5VSB -12V DC Watts/
AC Watts
P.F. Eff.
10.2% 1.5A 1.5A 7A 0.5A 0.2A 101.8W/
0.981 84.3%
3.33V 5.04V 12.06V 5.09V -11.47V

And again, things look good for efficiency, with the 10% load test already bringing almost Silver levels of efficiency. Very, very nice.

Let's get to the good stuff now.

Results from Seasonic SS-1000XP COLD load tests
Test # +3.3V +5V +12V DC Watts/
AC Watts
Eff. P.F. Intake/
Progressive load tests
1 1.5A 1.5A 15.5A 204.3W/
89.3% 0.990 24°C/
3.33V 5.04V 12.06V
2 3A 3A 31A 405.7W/
90.9% 0.993 24°C/
3.33V 5.04V 12.04V
3 4A 4A 46A 596.3W/
90.7% 0.996

30 °C

3.33V 5.03V 12.02V
4 5.5A 5.5A 62A 803.1W/
89.1% 0.997 25°C/
3.33V 5.04V 12.01V
5 7A 7A 77A 999W/
88.6% 0.997 26°C/
3.33V 5.03V 11.99V
CL1 15A 15A 4A 178.3W/
85.1% 0.991 27°C/
3.32V 5.03V 12.05V
CL2 0A 0A 83A 1000W/
88.9% 0.997 26°C/
3.33V 5.04V 11.99V

Folks? If you see my family, tell them I died happy. This has to be heaven, because no earthly power supply is capable of 0% voltage regulation on any rail. Look at that... the 3.3V rail did not move between tests one and five. It did... not... move. Not one little itty bitty eeny meeny teensy weensy bit. It started at 3.33V, it ended at 3.33V. And at no time in the middle did it read any other number. Even crossload test one, where both the minor rails were socked right out, it still only deviated by 0.01 volts.

Seriously... screw everything else, I'm already impressed. But it only gets better, because the 5V rail darn near did the same thing! 0.2% regulation. Seasonic... come on, now. Fess up. You hired Harry Potter, Merlin, or Gandalf the White to run the engineering department, didn't you? And the 12V readings... good gravy, Davey. 0.6% regulation there. It's all over... nobody's touching this kind of voltage regulation, except maybe Zippy and Delta. And even those two are going to have trouble doing it.

So between the progressive load tests, we're looking at an average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... 0.3% regulation. Average... oh, sorry. Got a little caught up in the awesomeness there.

Moving on to the efficiency numbers, this unit had an average of 0.3% regu... er, I mean, some other pretty gosh darn magic numbers. Now, this unit did have some trouble hitting Platinum on my load testing gear. This could be because I don't work to stabilize incoming line voltage on purpose, but it really doesn't matter. When you take into account the error tolerance of my power meter, it does pass Platinum. Good enough. I grade on pass or fail here, and this is a pass.

Let's go to the next page. This unit couldn't possibly get more awesome than this, but we'll see what the hot box can do to it.

Page 3 - Hot Testing

Overshoot Transient Testing - Seasonic SS-1000XP
VSB to Full, 12V
Off to Full, 12V

First up is the usual power on transient testing. And look at that, this thing is still being awesome. All three waveforms do show a spike, but it is a very minimal spike and nowhere near ATX spec. Passes rise time guidelines, too.

Time to get on with the real fun... the hot box testing. I found no temp spec on the box, so I'm going to assume fifty degrees. Heck, why not... I haven't let a unit pass fifty for quite a while now. Let's turn the hot box exhaust fan off, too.

Results from Seasonic SS-1000XP HOT load tests
Test # +3.3V +5V +12V DC Watts/
AC Watts
Eff. P.F. Intake/
Progressive load tests
1 1.5A 1.5A 15.5A 204.4W/
89.3% 0.989 30°C/
3.34V 5.04V 12.06V
2 3A 3A 31A 405.7W/
91.0% 0.993 37°C/
3.33V 5.04V 12.04V
3 4A 4A 46A 596.3W/
90.8% 0.996 44°C/
3.33V 5.04V 12.02V
4 5.5A 5.5A 62A 802.5W/
89.0% 0.996 47°C/
3.33V 5.04V 12.00V
5 7A 7A 77A 998W/
88.3% 0.997 51°C/
3.33V 5.04V 11.98V
CL1 15A 15A 4A 178.3W/
84.9% 0.991 34°C/
3.32V 5.03V 12.05V
CL2 0A 0A 83A 1000W/
88.7% 0.997 47°C/
3.34V 5.04V 11.99V

Hello, Christmas. Came early this year, did you?

Some units do tend to do better for efficiency in the hot box, and this is one of them... up to a point. Test five is down, test one is the same, but the others are all improved just a bit. Another pass from me on Platinum.

But those voltage readings? I want to marry this power supply right now. Now, it's the 5V rail refusing to budge, while the 3.3V rail deviates by a mere 0.01V. The 12V rail does slip a little bit... again by 0.01V. And this is at fifty one degrees, people. Higher than most units are rated for. I just... cannot hurt this thing for the life of me. Again... 0.3% average regulation. If I round off, that is... in reality it's a fraction of a percent worse regulating in the hot box than at room temp.

Like we're going to argue about that, right?

Let me spell it out for you other PSU design sorcerers at Seasonic's competition. This power supply, this one right here, is the tightest regulating unit I have ever tested. Period.

Oscilloscope Measurements - Seasonic SS-1000XP
Test #

Well, I suppose when you're coming from numbers like we just saw, something had to give. Sadly, the ripple suppression is not the best I've ever seen. It is, however, very good indeed. The 12V had a little bit of that odd boogie woogie thing going that these LLC resonant designs tend to have, where it will alternate low ripple with higher ripple, so I did my best to capture the high side of it. Just a bit over 50mV, which is under half the ATX spec. Not bad at all.

Over on the minor rails, the scope did pick up the occasional blip up to spec, but most of the time these rails were under 30mV. Just over half the spec.

Let's get this bad boy apart.

Page 4 - Disassembly

And now for the taking apart phase of the review. Here's a fan picture.

An overhead shot gives the impression that this unit was adapted from the X series platform.

A look at some of the thermal pads on the housing.

Seasonic's soldering quality is again well above average. I did spot some flux residue on the PCB that didn't get washed off, but that's not too big a deal. It happens.

Eight of these provides the 12V output on this beast - they are 018N04LS parts. They are heatsinked through the PCB and the housing, as was the case for the X series models.

AC line filter here, next to the power switch.

More line filtering out front. Two coils, two X caps, two Y caps, and a MOV.

This here daughterboard houses a PS232F protection IC.

One of four 6R190C6 switching transistors can be seen in the middle of the picture.

All capacitors are Nippon Chemi-Con. That little daughterboard in front of the three main filter caps houses a CM6901 PWM controller.

PFC section is done with these parts. Not having a lot of time, I decided against pulling parts to ID the PFC chip. On this unit, it would be like taking the frame off the Mona Lisa just to see if the artist wrote "da Vinci rulezzzz LOL" in the margins.

The VRM section is controlled by an APW7159. I could not ID the other parts.

The other side of the VRM.

You heard it from me first. Us Schrags, Schraggs, Schracks, and other Schrag phonetic deviations are taking over the world. We're quietly putting our relays in the most innocent looking gadgets, and when you least expect it, whammo... total chaos. The world may avoid this chaos by paying each one of us a million dollars. I'll be waiting for my share in my secret volcano lair, provided it doesn't erupt again.

Page 5 - Scoring

Performance (40% of the final score) - so... how do we score something clearly designed by wizards to completely wipe out the competition? Easy. I'll take away points as usual. From a perfect score, I find myself having to take away half a point for ripple suppression. It was real good, but not the best ever. But... I have never seen a unit average better than 0.5% regulation, either. I'm going to do something I rarely do. I'm going to put that half point back on. This is as close to the perfect power supply we're going to get, people. 10.

Functionality (20% of the final score) - lots of modular cables. Full modularity. Sleeving well done. Plenty of connectors. Lots of goodies in the box. A very nicely printed user guide. Sounds like a certain power supply is getting another 10.

Value (20% of the final score) - this unit costs $264.99 at FrozenCPU, more than some rather good 1200W units out there. Heck, the Corsair AX1200 is only about $35 more than that. And yes, that unit does have better ripple suppression than this one does. But voltage stability? Not happening. Not even that big bad Corsair can touch this monster of stability. We will go with a 9.5 here.

Build Quality (20% of the final score) - once again, Seasonic's best work has very few items worth complaining about. The only one, in fact, is the soldering. One point gone for that. 9.







Build Quality


Total Score



Was the long wait for this unit to hit the marketplace worth it? Yes. Have I seen a unit outperform this one for voltage stability? No. There's only one more question that needs to be asked, people: how fast can you buy one?

The Good:

  • Extremely good voltage stability - best I've seen to date
  • Platinum efficiency is no problem
  • Fully modular
  • Has a selectable semi-fanless mode
  • Excellent build quality

The Bad:

  • How the hell is Seasonic going to top this one?

The Mediocre:

  • How the hell is anybody going to top this one?
We've also teamed up with Seasonic to giveaway one of these monsters. Head over to the contest page to check it out.

This review was provided by : JonnyGURU

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