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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
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Learn more about the SeaSonic USA X-850 (SS-850KM3 Active PFC F3)

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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  • Thomas K.
  • 7/23/2015 3:48:51 PM
  • Tech Level: Average
  • Ownership: 1 day to 1 week
  • 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: I have no pros to list. The unit was dead on arrival. It did com ein a pretty black velvet bag.

Cons: It seems about 10% of the reviews for this device complains of a dead on arrival unit or the unit not working very long. If 1 out of 10 products you make is dead and useless, it would make one think the quality of the product isn't very good.

Did you find this review helpful? Yes No

  • Marc B.
  • 7/11/2015 3:17:49 PM
  • Tech Level: Somewhat Low
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsNice! I LOVE Fully Modular!

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: 1) Fully Modular - After going from an old non modular PSU to this one, WOW is all I can say about how much free room there is in my case now! I will NEVER buy anything that isn't full modular again! :)

2) Setup was pretty simple, even for a noob like me. The connections on the PSU are pretty clearly marked, and you get a good amount of cables. Only real problem I had was realizing the 2 motherboard power connections on the PSU are on the right side of the PSU. First time with modular PSUs, so something new to learn.

Cons: None that I can even think of.

Other Thoughts: Running an i7 4790k, MSI Gaming 5 board, MSI r9 390 8gb video, 16gb Ripjaws X Series ram. I doubt I'm stressing this PSU too much for what I use the computer for.

I don't currently overclock(might try it in the future).

Did you find this review helpful? Yes No

  • HYON K.
  • 6/25/2015 3:52:46 PM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

1 out of 5 eggsDead after a year

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: good when it worked

Cons: This PSU gave me so much trouble..

It fried my GTX 980TI last night..

Many of owners of this PSU already experienced that the PCI-E cable melted and bonded on the PSU side. It was nearlly impossible to take the cable out since it melt like a cheap plastic..

I did not know it melt and played a game for 10 min. there was a few random reboot (didn't know it was due to PSU)

10 min later, VGA died and it was only output signal at 640x480

I am sending it for RMA.. hopefully they will replace it for free.
still need to deal to repair VGA..

Other Thoughts: I'd try something else next time..this PSU should've handle 980ti easily..

Manufacturer Response:

Hi Hyung, I am sorry for the inconvenience this has caused you. It is possible that the connector was not properly seated and caused the melting of the connector. As well, it is advisable to use one dedicated PCIe cable per single PCIe connector on the VGA. Our service center should be able to help you with your PSU. Thank you.

Did you find this review helpful? Yes No

  • James S.
  • 4/24/2015 4:58:13 PM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsPSU, WHat is there to say

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 wires allows you to only use the ones you need and leave off the ones you don't to ease the wire clutter in the case.

Flat wires allow for wires to be over lapped behind the motherboard tray for easier wire management and routing.

Very quiet fan. I can not and have never heard this PSU's fan over the rest of the case fans installed.

Actually puts out the 850W or more that it is rated for. I have run an HD 7970 OCed and a R9 280 OCed along with a Phenom II X4 965 OCed to 4.073 GHz on this PSU and it never even hiccuped.

Cons: Doesn't make the PC levitate off the floor. I really can not think of any. I would buy it again.

Other Thoughts: Running this PSU has been a pleasure. I have never worried that if something went wrong and the PC crashed it was the PSU.

Like I mentioned before I have stressed this PSU to it's max and it never had an issue. When I say stressed I mean with stress test programs and bench marking.

This thing will handle most dual SLI/Crossfire setups. If you are looking at triple card setups you already know to shoot for the Kilowatt or higher range for a PSU.

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  • Eric M.
  • 4/23/2015 11:53:07 PM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

1 out of 5 eggsSeasonic USA - Bad Attitude & Bad Equipment

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

Cons: Kevin in the Seasonic USA was so rude, accusatory and non technical! I used Seasonic's paper clip test, and it failed. I tried 2 motherboards and they both were failing. So I RMA'd it. Twice! Still have not received it back. No reports, just big attitude from Kevin in Asuca, Ca.

Other Thoughts: Do NOT buy the Seasonic Power Supplies!

Manufacturer Response:

Hi Eric,

Per our RMA processing and correspondance, we have informed you that you have incorrectly performed the "paper clip test" because you have connected the wrong pinouts on teh 24Pin connector. You must connect the PS ON to GND only.

Your PSU was tested multiple times and each test result showed the PSU to be in good working condition. This is the information we have forwarded to you. I am sorry if this is not what you are hoping for but this is the result of our testing. Thank you.

1 out of 4 people found this review helpful. Did you? Yes No

  • Christian S.
  • 3/27/2015 9:02:02 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsSeasonic X Series Power Supply

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 everything I expected from a name like Seasonic. Fully modular, 80+ Gold and a near silent fan, premium build quality and excellent efficiency and voltage regulation. I have all the connectors I need installed without having to figure out what to do with all the extra cables and it doesn't run hot even though it's blocked off from the rest of the case by a PSU shroud.

Cons: None

Did you find this review helpful? Yes No

  • Amazon.com V.
  • 1/8/2015 6:48:58 AM
  • Tech Level: Somewhat High
  • Ownership: less than 1 day
  • Verified Owner

1 out of 5 eggsDOA - Tried in two working computers

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: Excellent presentation. Enough cables for most builds. Low fan noise. Also has hybrid fan control to reduce noise.

Cons: Installed in working computer. It screamed at me after turning on, computer did not boot. After checking cables again, it stll screamed, fan came on. Then nothing. After reinstalling old PS, computer worked. Tried in second working computer, no turn on or boot.
No manual or warrenty card, but found online. No picture of modular panel.

Other Thoughts: I tried it in a working computer before risking it on my new build. I am glad I did. My plan was to replace the Motherboard, CPU, memory and Power Supply in my old computer to get better performance. I will now have to rethink my goals.

Manufacturer Response:

Hi Jim, Sorry but can you please write to: newegg@seasonicus.com and please let us know what has happened to your power supply. I am not clear on what you mean by "it screamed at me after turning on, computer did not boot". Normally speaking, the PSU will not make any noises and if the computer did not boot, you must check to make sure all the cables are properly connected and use only the cables provided with the PSU, none other.
As well, inside the power supply carton is the user manul & warranty card, so this is strange that you did not find any. Please write to: newegg@seasonicus.com and please let us know what happened so we can do our best to resolve your issue. Thank You.

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

  • Joseph S.
  • 1/2/2015 5:14:34 AM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsWorth the Price

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 which really simplifies cable management.
No noise as the fan rarely turns on or is needed.
Plenty of power.
Reliable

Cons: None

Other Thoughts: I have two builds with this model, both about 2-years old, and two builds with its earlier 850W model, now 6-years old. There are cheaper PSU's on the market but the Seasonics are so reliable that they are never a cause for concern and are well worth the investment.

I blow the dust out of the PSU once a year!

Cable sleeving appears to have changed since I last purchased a Seasonic X Series.

I've run numerous overclocking configurations with GTX 680's and 780's in SLI mode and this PSU just keeps on running.

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

  • Robert M.
  • 12/15/2014 1:34:13 PM
  • Tech Level: Average
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggs

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: Has all the connections you will need for sli, raid setups, etc... 6 year warranty...

Cons: None...

Other Thoughts: A little expensive but quality build...

Did you find this review helpful? Yes No

  • Richard C.
  • 12/1/2014 7:49:32 PM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsSolid 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: Rock solid and stable.
Modular.
Quiet fan.
Reasonably small size for the power.

Cons: Cable sleeving is kind of cheap - still better than a lot of the stuff out there, though.

Other Thoughts: Though I haven't come close to taxing this PSU, I've toyed with overclocking my CPU and GPU at different times, and it never missed a beat.

Did you find this review helpful? Yes No

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SeaSonic USA > 
Item#: N82E16817151102
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