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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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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

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

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 7 years
  • Limited Warranty period (labor): 7 years
  • Read full details

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

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  • Paolo Y.
  • 4/28/2016 1:19:44 AM
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsgreat 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: -super quiet
-stable clean power
-all black flat cables
-well built quality product
-cables long enough to be routed through my massive 780T case

Cons: none

Other Thoughts: I would definitely recommend this to someone looking for a 80plus gold psu

Did you find this review helpful? Yes No

  • Andrew M.
  • 4/20/2016 11:15:05 AM
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsRebate is a RIP-OFF. Shame on Newegg!

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: UPDATE on 4-20-2016:
Rebate forms mailed in on 1-20-2016. Form says allow 1--12 weeks for rebate payment. After waiting 12 weeks i checked their website. Website says i will receive a "response" by May 13. Phoned their toll-free number and was told i can expect to hear from them by "the end of the third week in May". That's an additional 4 1/2 weeks on top of waiting 3 months already. So, i must wonder if they print "allow 10-12 weeks" on the mail-in form and keep delaying, is it fraud? Must also wonder why Newegg.com continues to associate itself with such incompetents and scoundrels. Needless to say, i'm deeply disappointed not by the amount of money involved but by the lies and trickery and continued delays in honoring a properly submitted rebate request sent in well before the deadline!

Delivers stable, steady power with very low variation and low ripple.
Modular cables are flexible, making them easy to route.
Cable lengths seem just right for mid-tower case.
Rejuvenated my older power hungry Core i7 system (see Other Thoughts below).
Long warranty.
Comes in a velvet bag :D

Cons: Cable lengths are fine for bottom mount in a mid-tower case, but they might be too short for bottom mount in a full tower case.

Other Thoughts: This Seasonic X850 replaced a Corsair TX750 in my older PC which includes Core i7-965ee (130watt TDP), 6 x 2GB RAM, GTX-760 graphics card, 2 x SSDs, 3 X HDDs , 1 x Blu-ray drive, 1 x DVD drive, 2 x 120mm case fans, 1 x 140mm case fan, gaming keyboard & mouse. Three of the RAM modules, two HDDs and the extra DVD burner were added over time. Although the calculated power requirements fell within the range that the Corsair TX750 should handle, there were occasional glitches and spontaneous re-boots. Also, a couple of games wouldn't run optimally. (Example: Crysis 3 ran smoothly at Medium quality setting but at any higher settings it would sometimes stutter during intense action.) After upgrading to the Seasonic X850 everything runs smooth as silk without a single glitch so far. That Crysis 3 game is now running smoothly on Very High setting, would you believe! It's only been a couple of weeks since the Seasonic was installed, yet it has clearly breathed new life into this older rig. It can also support a new system if any of the old core components decide to give up the ghost. But, with stable, ripple-free power i'm hoping the old motherboard/cpu/RAM combo will soldier on for a while longer.
Last year i did build a new Core i5 system with 2x4GB RAM, 1xSSD, 2xHDD and 1xDVD. Decided to power it with a Seasonic G-series SSR-550. It impressed me a lot so then decided to watch for a sale or rebate on the X850 for my older PC. Glad i did!

Manufacturer Response:

Hello Andrew,

Thank you for your comment. We are sorry about your problem with your reseller. The 1 egg is very negative for our product even if it seems that you are fully satisfied of it.
Thank you and have a nice day.

Did you find this review helpful? Yes No

  • Robert R.
  • 4/7/2016 8:53:52 AM
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsVery Disappointed this time with Seasonic

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: The usual great Seasonic PSU while it lasted

Cons: Died in less than 60 days after installation

Other Thoughts: I've had nothing but a perfect record with numerous Seasonic PSU's until this one. In addition to my own personal and customers computers I also do IT at a radio station and only buy Seasonic PSU's for the computers that I build and service. I have no exact idea of what failed but it appears to be in the ATX power section, power light on mobo lit but no functionality. Fortunately I have spare PSU's and hand and a replacement got it up and running again this morning. I'm actually using that PC at the moment after the PSU swap. In this case I feel Seasonic should also cover return shipping due to the short time this one lasted. RMA submitted.

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

  • Rebecca B.
  • 3/27/2016 4:15:04 PM
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsHybrid mode is so quiet!

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: Easy to set up! Fully Modular so it's easy to work with as expected. The hybrid mode makes this thing dead silent at idle workload.

Cons: I wish the power switch and wording on the back of the power supply was flipped around. It has it so that when the fan is down, which is pretty standard for builds these days, the text is upside down.

Other Thoughts: I got this on sale with a mail in rebate and would snag another at the deal I scored. Even at normal price, this is a fantastic quality product and the warranty is INSANE (7 years).

Did you find this review helpful? Yes No

  • Mark M.
  • 3/22/2016 6:56:52 PM
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsWorks pretty well

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: - Runs quieter compared to anything I have ever owned before
- Was very easy to install
- Wires included were perfectly sized
- Was inexpensive for the amount of power

Cons: - I have yet to run into any issues

Did you find this review helpful? Yes No

  • Anonymous
  • 3/8/2016 6:12:52 PM
  • Ownership: less than 1 day
  • Verified Owner

1 out of 5 eggsBurn Baby, Burn

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 nice box and cables.

Cons: Burned both of my hard drives and disk drive as soon as I started it. There was a large crack, saw sparks fly out of the drives, and then smoke immediately after. Just opened it up and hooked it up the same day I got it, aka today. Going to RMA and hopefully get a new one soon, if not I will take a refund and buy from a different company.

Other Thoughts: I know they won't pay for my hard drives or disk drive, but I wish they would take responsibility for their faulty product.

Manufacturer Response:

Hello,

Sorry to hear your problem with our product. If not yet done, kindly apply for RMA for us to test your product: http://seasonic.com/apply-for-rma/
If you have any question or comments, please kindly let us know at: newegg@seasonicus.com
One more time, I'm really sorry for the inconvenient.
Thank you and have a nice day.

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  • Rongcheng X.
  • 3/7/2016 2:21:07 PM
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsA product catches my loyalty back to Seasonic

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: Slient, effective and efficient. I have 8 case fans installed and the airflow is good enough. So the PSU fan doesn't need to work mostly under hybrid model. And it decreases the noise level further.
Great design and outstanding quality control. You can find good details on cables.
Seasonic has been a great and experienced PSU maker for several decades.

Cons: None at this point

Other Thoughts: I have been a seasoonic fan since 1999 and I only used their top products like X series. In 2014, I purchased 3 plantiam certified PSU from Newegg (two 1000ws and one 1200w), all of them were DOA. That made me be very disappointed. But this time, this shopping experience catches my loyalty back to SS.
If your machine composed 3 or less vga card, I think this one is enough; if you need 4 vga cards, I think you need to go up to Seasonic1050w or 1250w. Plz remember to choose X series.

Did you find this review helpful? Yes No

  • Keith L.
  • 3/4/2016 6:34:35 PM
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsA very nice working 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: It has plenty of hookups and all the wires you need and then some. It is also very short in length so it doesn't extend all the way up to your hdd bays. It fired right up out of the box and every component including the motherboard are getting their recommended power. This psu is running the following:

MSI Gaming 5 Z97 socket 1150 Intel motherboard
NZXT H440 Black/Red Case with case fan controller pushing 3 140mm and 5 120mm fans,usb ports,power switch and leds connected
Intel Core i7-4790K Devil's Canyon Quad-Core 4.0 GHz LGA 1150
MSI Radeon R9 390 GAMING 8GB 512-Bit GDDR5 PCI Express 3.0
HyperX Beast 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 2400
SAMSUNG 950 PRO M.2 256GB PCI-Express 3.0 x4 Internal Solid State Drive (SSD) MZ-V5P256BW

Cons: None. Nice price considering a friend of mine bought the 650 watt version of this psu for the same price a week earlier and I paid the same for a 850 watt version and less after rebate.

Other Thoughts: I had to convert to Seasonic due to Corsair not honoring their warranty on a 1000watt psu that was still under warranty so I told them I would never buy another Corsair psu again and fixed the 1000watt psu myself and after all the Corsair psu's I own that still work, I had to convert to Seasonic for a new build.

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

  • Anonymous
  • 2/29/2016 7:42:55 AM
  • Ownership: 1 week to 1 month
  • Verified Owner

1 out of 5 eggsDidn't Start, Killed SSD

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
Hybrid (no fan noise at low temps)

Cons: Didn't turn on (despite the 'jump start' method)
Killed SSD
Mobo connection tricky on both ends

Other Thoughts: Currently RMA'd
Should've gone with EVGA G2 850W

Manufacturer Response:

Hello,

Sorry for the problem you encounter with our product. We always do our best to avoid such situation. Kindly ask for an exchange with Newegg. If you have any question or comment, please email us at: : newegg@seasonicus.com
Thank you.

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

  • Derrick L.
  • 2/19/2016 5:06:01 PM
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsGreat powersupply

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
- Hybrid mode works great, the fan pretty much never spins up (not using that much power though).

Cons: - Cables are rather stiff

Other Thoughts: - Got it on sale so it was a very good deal.

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

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Item#: N82E16817151102
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