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SeaSonic USA > 
Item#: N82E16817151102

SeaSonic X Series X-850 (SS-850KM3 Active PFC F3) 850W ATX12V v2.3 / EPS 12V v2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Full Modular Active PFC Power Supply New 4th Gen CPU Certified Haswell Ready

  • ATX12V v2.3 / EPS 12V v2.91
  • Full Modular
  • 80 PLUS GOLD Certified
  • Full Range: 100 - 240V (Max. 90 - 264V) 50/60 Hz
  • +3.3V@25A, +5V@25A, +12V@70A, -12V@0.5A, +5Vsb@3A
BUY WITH CONFIDENCE
This product qualifies for the Iron Egg guarantee. We'll match any qualifying competitor's price.
BUY WITH CONFIDENCE
This product qualifies for the Iron Egg guarantee. We'll match any qualifying competitor's price.
IronEgg
BUY WITH CONFIDENCE
This product qualifies for the Iron Egg guarantee. We'll match any qualifying competitor's price.
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Learn more about the SeaSonic USA X-850 (SS-850KM3 Active PFC F3)

Model

Brand
SeaSonic
Model
X-850 (SS-850KM3 Active PFC F3)
Series
X Series

Spec

Type
ATX12V v2.3 / EPS 12V v2.91
Maximum Power
850W
Fans
1 x Sanyo Denki Ball bearing fan
PFC
Active
Main Connector
20+4Pin
+12V Rails
Single
PCI-Express Connector
4 x 6+2-Pin
SATA Power Connector
8
SLI
SLI Ready
Haswell Support
Certified
CrossFire
CrossFire Ready
Modular
Full Modular
Energy-Efficient
80 PLUS GOLD Certified
Input Voltage
Full Range: 100 - 240V (Max. 90 - 264V)
Input Frequency Range
50/60 Hz
Input Current
10 - 5A
Output
+3.3V@25A, +5V@25A, +12V@70A, -12V@0.5A, +5Vsb@3A
Approvals
CB, cTUVus, CCC, TUV, GOST-R, BSMI, CE, UKR, FCC, C-tick
Dimensions
6.3" x 5.91" x 3.39"

Features

Connectors
1 x Main connector (20+4Pin, 600mm)
1 x 4+4 Pin EPS 12V (650mm)
1 x 8 Pin EPS 12V (650mm)
8 x Peripheral
8 x SATA
2 x Floppy
4 x PCI-E (600mm)
Features
80PLUS Gold Certified Super High Efficiency

Full Modular Cabling Design

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 degrees C Japanese Brand Capacitors

Tight Voltage Regulation (+/-3%)

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

Quick Info

Warranty

  • Limited Warranty period (parts): 7 years
  • Limited Warranty period (labor): 7 years


Customer Reviews of the SeaSonic USA X-850 (SS-850KM3 Active PFC F3)

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Showing 121 of 121 reviews - Clear Filters

  • David R.
  • 6/28/2014 2:26:37 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsExcellent PSU

This review is from: SeaSonic X Series X-850 (SS-850KM3 Active PFC F3) 850W ATX12V v2.3 / EPS 12V v2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Full Modular Active PFC Power Supply New 4th Gen CPU Certified Haswell Ready

Pros: Fully modular, extremely quiet (I've never heard it make any noise), and the bag it comes in is beautiful.

Cons: Honestly, I haven't had any problems with it.

Other Thoughts: The fully modular design makes cable management a dream come true.

Did you find this review helpful? Yes No

  • MICHAEL D.
  • 6/22/2014 3:14:56 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsVery quiet, efficient and powerful PS

This review is from: SeaSonic X Series X-850 (SS-850KM3 Active PFC F3) 850W ATX12V v2.3 / EPS 12V v2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Full Modular Active PFC Power Supply New 4th Gen CPU Certified Haswell Ready

Pros: SeaSonic is one of the most trusted power supply makers out there. I did a little research and SeaSonic makes Power Supplies for other well known power supply brand names. So why not get it from them direct? It arrived in a really nice box with a soft cloth cover. Opening the box, I felt like I was about to open a box with some diamonds in it. You'll see what I mean if you get one. You won't go wrong with this PS.

Cons: None, my PC has zero problems with power, it's a very powerful, quiet power supply.

Did you find this review helpful? Yes No

  • Gabe A.
  • 6/20/2014 12:26:38 AM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsBest PSU I've Owned

This review is from: SeaSonic X Series X-850 (SS-850KM3 Active PFC F3) 850W ATX12V v2.3 / EPS 12V v2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Full Modular Active PFC Power Supply New 4th Gen CPU Certified Haswell Ready

Pros: This is a solid PSU, fan rarely spins. Seasonic quality is outstanding and runs cool.

Cons: None

Other Thoughts: Currently overclocking a 1090T at 4Ghz
Purchasing another to (hopefully) overclock an FX 8350 to 5Ghz

Did you find this review helpful? Yes No

  • Matthew P.
  • 6/12/2014 7:44:01 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsVery good PS

This review is from: SeaSonic X Series X-850 (SS-850KM3 Active PFC F3) 850W ATX12V v2.3 / EPS 12V v2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Full Modular Active PFC Power Supply New 4th Gen CPU Certified Haswell Ready

Pros: I've been using this heavily for almost a year in a Phantom NZXT case, with 11 internal drives and 4 external USB 3 drives. Lots of fans in the Phantom of course, this is a heavily used server machine that gets constant use, and the PS is awesome, replaced a 600 that may or may not have been having issues, not sure, but I'm very happy with this and it's highly rated with a huge warranty.

Cons: None at all

Other Thoughts: None

Did you find this review helpful? Yes No

  • Michael R.
  • 6/11/2014 7:30:37 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsRock solid design and performance.

This review is from: SeaSonic X Series X-850 (SS-850KM3 Active PFC F3) 850W ATX12V v2.3 / EPS 12V v2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Full Modular Active PFC Power Supply New 4th Gen CPU Certified Haswell Ready

Pros: Impressive compact size for an 850w PSU. + 1 Egg

Fantastic design. This PSU boasts what is, in my opinion, simply the greatest modular design of any PSU I've used in 20 years. + 1 Egg

Flawless power! This PSU delivers exactly what it advertises, with more than enough to run an AMD FX-8350, 2x DIMMs, 2x SSDs, 1x 7200-RPM HDD, 1x optical drive, and 2x GeForce GTX 760s, as well as 6 case fans. It's a beast!! + 3 Eggs

Cons: None

Did you find this review helpful? Yes No

  • Christopher I.
  • 6/5/2014 8:05:13 PM
  • Tech Level: Average
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGood psu

This review is from: SeaSonic X Series X-850 (SS-850KM3 Active PFC F3) 850W ATX12V v2.3 / EPS 12V v2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Full Modular Active PFC Power Supply New 4th Gen CPU Certified Haswell Ready

Pros: Very reliable, made with good quality materials, isn't loud, fully modular, 80+ gold.

Cons: none that i can think of other then the price

Did you find this review helpful? Yes No

  • Maria M.
  • 4/30/2014 5:29:34 AM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year

1 out of 5 eggsUnreliable Products and Support

This review is from: SeaSonic X Series X-850 (SS-850KM3 Active PFC F3) 850W ATX12V v2.3 / EPS 12V v2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Full Modular Active PFC Power Supply New 4th Gen CPU Certified Haswell Ready

Pros: Gold rated. The included velvet bag is nice as well; I'm sure it'll make my dead PSU look even better

Cons: First unit blew a capacitor shortly after a year. Received a faulty shorting PSU as a replacement. Way to go. I can't prove it, but I'm pretty sure one of it's surges killed the audio on my motherboard. About a week later, one of the PCI-E cables started burning and is now bonded to the PSU. I contacted support earlier about the electrical shortining I was hearing coming from the PSU, but was assured it was perfectly normal and that it was probably coil whine. Really? A dog doesn't meow -- it barks. I've been trying to contact support for the past couple of weeks, but all my emails are getting rejected. Unreliable products and support; it seems fitting.

Other Thoughts: I still like Seasonic PSUs, but this experience is making me lean towards Corsair for my next purchase (and yes, I do know Seasonic makes manufactures certain Corsair products as well). Hopefully I just received 2 duds in a row. Until I get a working replacement, I'll just keep posting these bad reviews wherever I can.

Did you find this review helpful? Yes No

  • Matthew B.
  • 3/24/2014 5:47:43 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsX-850: Overall Great Product

This review is from: SeaSonic X Series X-850 (SS-850KM3 Active PFC F3) 850W ATX12V v2.3 / EPS 12V v2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Full Modular Active PFC Power Supply New 4th Gen CPU Certified Haswell Ready

Pros: - Quiet fan
- Fully modular
- Absolutely no problems so far (I've had it for 9 months now)
- Cable length for the most part was fine

Cons: - The 4 pin connector for the mobo was a little too short to run through the back of my Corsair Carbide 400R for uber cable management
- not sure how many PSUs come with braided cables, but it would have been nice...

Other Thoughts: I know that Corsair has official braided cables for its PSUs...I haven't been able to find this on Seasonic's website, but would love to get a green/black set for increased swag and cable management.

Did you find this review helpful? Yes No

  • wallace l.
  • 2/26/2014 4:04:21 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsA must have..

This review is from: SeaSonic X Series X-850 (SS-850KM3 Active PFC F3) 850W ATX12V v2.3 / EPS 12V v2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Full Modular Active PFC Power Supply New 4th Gen CPU Certified Haswell Ready

Pros: This PSU is solid, and you can sum up the level of quality relatively fast, even without the elaborate packaging and sacks..lol, yes, "sacks" to store your cables in... I'm not complaining, I just think its bizarre lol. Not sure if I bought a PSU or a bottle of Crown...

Make no mistake though, there are few occasions where product quality really does justify a little packaging bling, and when you buy a PSU, and you have the money to make sure you get the best brand on the market, you buy a Seasonic.

Cons: This isn't a con, but for those out there that haven't done a build in a few years, or even if you're just replacing an older PSU, there is one step that is a bit different. As most people know, this PSU, and most modern quality PSUs are fully modular in order to grant better cable management. You'll notice that on the Seasonic X 850 there is an upper row of labels, and a bottom row; indicating which output connectors you should use, such as MB, PCI-E, Peripherals etc..

When you connect your 24 pin ATX connector which will extend out from the bottom row, there is an additional connector on the PSU side of the cable that plugs into one of the connectors on the top row. Your PC won't boot if you forget to plug that in. If my description seems complicated or vague, don't worry, you'll see exactly what I mean when you get yours.

Other Thoughts: Awesomeness.

3 out of 3 people found this review helpful. Did you? Yes No

  • Jose R.
  • 2/10/2014 10:49:39 PM
  • Tech Level: Average
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsGood buy for PSU

This review is from: SeaSonic X Series X-850 (SS-850KM3 Active PFC F3) 850W ATX12V v2.3 / EPS 12V v2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Full Modular Active PFC Power Supply New 4th Gen CPU Certified Haswell Ready

Pros: Fully modular. enough to power my gaming rig with one GeForce GTX 780Ti Graphic card and a bunch of fans. the cables are long enough too. being modular you can use the cables you need and the rest go in the bag it came with.

Cons: None

Other Thoughts: Good overall PSU. With SeaSonic, you know you spent your money in a good product.

1 out of 2 people found this review helpful. Did you? Yes No

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SeaSonic USA > 
Item#: N82E16817151102
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