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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 124 of 124 reviews - Clear Filters

  • Anonymous
  • 8/19/2014 11:07:23 AM
  • Tech Level: Average
  • Ownership: more than 1 year
  • Verified Owner

4 out of 5 eggsTough reliable 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: - Reliable
- Efficient surge and shorts protection: saved my system multiple times.
- runs cool and pretty silent

Cons: - auto fan option seems to let the PSU get to a rather high temperature before fan kicks in ! at least it contaminates all tower components with non exhausted heat not to mention PSU itself longevity and performance impact.
- Cables look good and are decently lenghted, but they are stiff, PCI-E cables each (of the 4) have 2 connectors: giving the impression that it would allow to power A modern video card with just one cable ( 2x 8 pin connectors per cable) : impression confirmed by the rather poor and not knowledgeable phone customer service, but FALSE: a R9 280X was artifacting because it was powered by one cable PCI-E only ( 6 + 8 pins).

Other Thoughts: great PSU
old school shielded cables option would be a plus.

Did you find this review helpful? Yes No

  • George S.
  • 8/19/2014 1:17:31 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsSo Far So Good - Mostly

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: Nice cosmetic. Worked from the first flick of the switch.

Cons: I miss the old BNC modular connectors like on my old PS. These cables and connectors seem fine, but are rather stiff and flimsy. I have a CoolerMaster CM Storm full tower case and the peripheral cable wouldn't reach from the ssd bay at the bottom of the case to the top optical bay. Had to use lower optical bay and attach SSD to top of its bay with velcro... or run an extra cable... which I didn't do.

Other Thoughts: Experienced whining through speakers even with volume all the way down while moving the mouse. This is usually due to noise generated in the power supply. I almost decided to return it on that alone, but after some tweaking to the gain structure in my horrendously overkill sound solution (yeah, it's a top pro-level PA system set up in 5.1... it's what I had laying around), I was able to minimize the noise floor to a level that is not noticeable and still get pretty good PC sound from MSI Gaming 7 on board sound.

Manufacturer Response:

Hi, thank you for your review. Please note, for coil whine, please enable all energy savings modes in your MB's BIOS and also disable VSync for the VGA. It is also possible the filtering at the power plugs or USB connectors is lower than requirement and it is causing a feedback to the PSU which gets amplified by the transformers. If you have any quesitons, please contact us at newegg@seasonicus.com Thank You.

Did you find this review helpful? Yes No

  • Jeffrey W.
  • 8/6/2014 5:17:18 AM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year
  • Verified Owner

1 out of 5 eggsDead on Arrival

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: None from my point of view - it never worked

Cons: DOA

Other Thoughts: Requested advance return so I could finish my computer build with minimal delay, but Newegg wouldn't do it. Bought PSU from another vendor.

Manufacturer Response:

Hi Jeffrey, All PSUs are thoroughly tested before shipping from our factory so I am very sorry you received a faulty unit, perhpas the issue occured during transport? As well, can you please double check to make sure all cables are properly seated for a good connection as this can affect the PSU on/off function. If NewEgg is not able to do the RMA for you, have you contacted Sea Sonic USA for support. If you have questions or concerns, please contact us any time at: newegg@sesasonicus.com Thank you.

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

  • 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.

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

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Item#: N82E16817151102
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