Seasonic X900 SS-900HP 900w PSU

Introduction & Specifications

Introduction

Over the past 30 years Seasonic have gained a reputation for manufacturing some of the most silent and stable power supplies in the market. With models such as the S12 as part of their portfolio, Seasonic will always be one of the first names mentioned to those seeking silence without compromising performance.

Back in November 06, we were given the chance to test their first ever modular PSU:- the M12. With unique modular cables and decent performance the M12 design was head-hunted by memory giants Corsair. After some minor alterations to the cooling layout of the M12, Corsair released the unit as their now extremely popular HX series.

With more and more high-powered units entering the market from a whole range of manufacturers it's hard to stay with the same product for too long, and for this reason Seasonic have released a new high-end, performance orientated unit named the X900. The X900 power supply is (not surprisingly) rated at 900w, has quad PCI-E connectors and most interestingly of all - an 80mm fan. Today I'll be putting this unit though its paces, comparing its performance to other similar units and finding out if Seasonic have managed to keep their finger on the pulse since the release of their last PSU almost a year ago.

What Seasonic Say:

Since the incorporation of Sea Sonic Electronics Co., Ltd. in 1975, we have maintained our focus on research and development and the production of quality power conversion products.

For the past decades, supported by cutting edge technology based upon a strong research and development team, Sea Sonic Electronics has provided timely and professional solutions to meet many of the IT industry's requirements.

For the future, we will continue our philosophy of dedication; innovation, professionalism and 4G's (Great Technology, Great Quality, Great Service & Great Price) in order to maintain our goal of continued long-term business partnerships and create "win-win" situations for our customers.


Specifications

The following information has been taken directly from Seasonic's recent press release and Nanopoint's (Seasonic's UK Distributor) website:

Seasonic X900 Power Supply – Ultimate Power & Performance

The Seasonic X900 is designed and built for power, performance, stability and reliability as demanded by power users, gamers and over-clockers. The X900 is a true 900W output power unit with a peak output of over 1,000 watts.

Seasonic X900 is equipped with multiple +12V rails to support high-end graphic cards’ need with a total power output of 72 amps. A Double Forward Converter circuit design achieves a 99% Active Power Factor Correction and an industry-leading efficiency rating of up to 88%. Additionally, the power supply utilizes a Dual Magnetic Amplifier circuit to maintain a class-leading 3% line regulation tolerance on all +12V output rails to meet the demands of high-end graphics cards, CPU’s and peripherals for accurate and stable power output.


Features

• Super high efficiency for energy savings, up to 88% efficiency
• 3% line regulation for +12v rails for maximum stability, security and performance.
• Multiple 12V outputs with enhanced +12V current capability to broaden utilization capabilities.
• High reliability aluminium electrolytic capacitors for increased product life and reliability.
• Active power factor correction [99% PF] for reduced line noise and power distortion.
• Advanced dual forward converter circuit design for added reliability and efficiency.
• Smart and silent fan control [S2FC], one of the best-performance noise controllers available on the market.
• 8cm double ball bearing fan for increased lifetime.
• 4x PCI-Express connectors to support high-end graphic cards. With 6p to 8p PCI-E adapters x2
• All in one DC cabling to support PC, IPC, workstations, servers and dual CPU systems.
• Patented easy swap peripheral connectors for easy plug and unplug connection.
• Total protection with Over Voltage, Over Power and Short Circuit protection.
• Fixed 220V AC input.
• >100,000 hours MTBF, excluding fan.
• RoHS compliant.
• PFC harmonics compliant, EN61000-3-2: 2000
• EMI/ EMC: CE, C-tick & safety approvals: CB, TUV & Semko

As we can see from the specifications above, the X900 provides support for the latest 8-Pin PCI-E powered graphics cards along with multiple +12v rails that Seasonic tout as offering enhanced stability, security and performance.

In addition to this, the X900 is rated at a whopping 88% efficiency. If these figures are indeed confirmed in our testing, this will make the X900 the most efficient PSU we've ever tested!

Seasonic X900 Specs

The X900 has a total of four +12v rails, each rated at 18 amps. This may not seem very impressive considering lower wattage PSU's such as the Tagan 2-Force II 700w quote output of 20 amps across four rails, but what we need to keep in mind is the total combined output of the unit. In the case of the X900 the total combined output is a whopping 72 amps, whereas units such as the Tagan may only be able to produce around 50 amps.
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Most Recent Comments

26-09-2007, 08:01:00

JN
"Seasonic have always been known for their high-end range of silent PSU's. Will their latest 900w beast - the X900 unit live up to their reputation and our expectations?"

http://www.overclock3d.net/gfx/artic...212954443s.jpg

Review

26-09-2007, 08:25:32

PV5150
Quality review as always mate, and what an excellent performer. I'll have the stability and efficiency over other blingy high-powered units any day. Keep up the good work

26-09-2007, 08:25:34

Mr. Smith
Almost 85% efficiency is very impressive.

Shame about the noisy fan, had they placed 2 fans in the unit - one intake, one exhaust - then the fans would not have had to reach full throttle like a single one does...

Quality PSU.

26-09-2007, 08:30:25

PV5150
Agreed, but you look at the load required (776w) to get it to be audible. Many probably wouldn't even get it to break a sweat.

26-09-2007, 08:36:13

Mr. Smith
oF COURSE!

I did overlook that rather important detail... Probably why pcp&p is silent - never breaks a sweat, not even benching!

This seems like another PSU for life

26-09-2007, 08:53:21

JN
Yeah it's a very good PSU for sure. As you've pointed out, its unlikely most people will ever hear this unit at full throttle, because it needs some serious load for that to happen.

Of course, if you was hell bent on making it total silent, you could always swap out the fan with a SilenX or something. Not that I'd advise anyone to fiddle inside a PSU

27-09-2007, 03:44:58

cube
Jeeze that is a PCP&C rip off if ever I saw one... the silnecer sprigns to mind when I look at that. Similar internal layout, same exhaust fan and positioning etc. But that is a good thing - more manufacturers like PCP&C mean more stable and quality PSU's. A single rail would have been nice but excellent PSU none the less - whopping efficiency!

27-09-2007, 10:02:33

ionicle
it looks quality tbh...

i'd stil have a pcp&c over it any day...but i bet its cheaper than the pcp&c equivilant....

27-09-2007, 17:30:53

MikeEnIke
Nice review, looks like a great little PSU, and don't take little literally lol

27-09-2007, 20:56:23

Allsorts
Good review mate, I like the good/mediocre/bad breakdown in the conclusions section.

I have to say I do like Seasonic PSUs.

28-09-2007, 10:16:45

HarryB
This looks quite good, I need a new PSU for SLI

28-09-2007, 15:31:34

ACCURISt
Quote:
Originally Posted by name='cube'
Jeeze that is a PCP&C rip off if ever I saw one... the silnecer sprigns to mind when I look at that. Similar internal layout, same exhaust fan and positioning etc. But that is a good thing - more manufacturers like PCP&C mean more stable and quality PSU's. A single rail would have been nice but excellent PSU none the less - whopping efficiency!
Quote from Dave Hammock @ http://forums.extremeoverclocking.com/showpost.php?p=1615995&postcount=234

SeaSonic M12 SS-700HM 700W [Performs as a Single +12V Rail PSU.] [Modular]

Up to +12V@56A, Rated@40C, Efficiency up to 85%, 3yr warranty

Corsair HX 620W [Performs as a Single +12V Rail PSU.]

Up to +12V@50A, +5VSB@3A

http://forums.extremeoverclocking.com/showpost.php?p=1615995&postcount=234

I think most manufacturers design around multiple rails to stay withing the ATX specification.

BitTech in their review of the Seasonic X900, state the Corsair is actually a 750w psu thats "under-rated" to 620w to guarantee silence. They suggest Seasonic should take the same approach with the X900 i.e. class it as a truly silent/quiet 700w psu. I guess if true in this respect with regards to silence you could argue the pcpwr is more like a corsair a 620w? ...well maybe a bit noisyer

28-09-2007, 15:44:45

ACCURISt
appologies if sounding like a troll as this was not intended! did a lot of research before purchasing my Seasonic X900 from www.xcase.co.uk for 116.32. This is about the same price as the PCPower Silencer 750 quad.

I can tell you this I am running:

Opteron 175 OC from 2.2 to 2.8GHz

X1900XT Crossfire Master + X1900XTX in crossfire OC to 688/1584 core/mem

2x 10000rpm raptors

2x 500GB WD RE2

2x 320GB WD RE

2x 200GB Seagate

1x 180GB IBM GXP IDE

under load the psu is cool and the fan runs idle speeds!

28-09-2007, 15:49:34

FarFarAway
Ye that system will only put out about what...300-400w?

28-09-2007, 16:10:17

ACCURISt
Quote:
Originally Posted by name='Kempez'
Ye that system will only put out about what...300-400w?
i was wondering about the output, but I guessed it to be around 400-500. i got the Seasonic to replaced my old PCPower 510 SLI turbo cool. I wasn't having much joy running crossfire. the cards were intermitantly not responding a little to frequently for my liking. this was occurring on a non-overclocked crossfire pc with a hard drive count of 6.
Reply
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