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Seasonic X850 Gold ATX 12V 24PIN 850W Active PFC 80PLUS Gold Modular SLI Ready Power Supply

Seasonic X850 Gold ATX 12V 24PIN 850W Active PFC 80PLUS Gold Modular SLI Ready Power Supply - 1
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Seasonic X850 Gold ATX 12V 24PIN 850W Active PFC 80PLUS Gold Modular SLI Ready Power Supply - 58217_l.jpg Customer Photos (0)
Seasonic Electronics

Reg. Price: $234.08  CAD
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Part #: SS-850KM

SKU: 58217
Shipping Weight: 7.6 lbs

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Customer Reviews of Seasonic Electronics SS-850KM

Product reviews on are screened for relevance and inappropriate content. Reviews may contain inaccurate information about the product. If there is a discrepancy, please use the Flag this Review link located beside each review. Reviews are not an endorsement expressed by, but opinions from customers based on their own experience with a product. We do not recommend you make purchasing decisions based on facts or opinions expressed regarding Seasonic Electronics SS-850KM reviews.
Experience: 3 Days


Near silent. Modular.
Included in the bag is a velvet pouch that you probably pay a little extra for.
Amazing PSU. very very quiet. (I haven't stressed it a lot, it might be loud when approaching full load.) A little expensive, and could probably be a little cheaper if they didn't include a velvet bag to put the PSU in, but if ever you are taking your powersupply for a walk and want to look classy, I guess you have that option now.

Experience: 1 Days


Great PSU.
160mm (fits in smaller cases)
Great PSU, I have the x660 model as well. The quality of these PSU's are second to none. Highly recommend it.

norman jiarong_l
Experience: 3 Days


solid build, quite on low loads, excellent cables
coil whine on high loads, i thought I could live with it but it was driving me crazy
brought an open box x850

very loud coil whine on high loads

Maybe will try the 860 once its on sale...

Experience: 2 Weeks


the best psu
quiet, fan only starts when the load is about 20 or 30 percent;

better than Silver stone ones

Experience: 1 Months


Work perfectly
Thick, stiff cable
Very good, quiet PSU.
You might have to bend the cable quite a bit while installing.

Experience: 1 Months


Very nice packaging
Long cable
Package is not seal
CPU connector layout could be a bit clearer
Cheap cables lack Seasonic quality
Manual is uninformative, and repeated in other languages
Quiet, work as advertised. The fan will spin when more power is being used. I am overwhelmed with joy when the CPU 8pin connector can reach all the way to top of the motherboard running through the back side of the case. This is the first power supply I bought recently that can do that. In my head, this power supply is a easy five stars rating.

However, the first power supply didn't work good. System shut down for no reason. Luckily, the problem was a short in the power cable 10+18pin (power supply side) to 24pin (mainboard side). If anyone didn't know this would think the power supply defective. Send the power supply, without the accessories, the defective poor quality 24pin cable, to Seasonic. They test the power supply, find nothing wrong with the power supply and will not ship it back to you until you pay the full $31. You can order the 24pin cable for $8 + $15 shipping. The least Seasonic could have done is to offer me a free 24pin cable for my time as consolation.

Fortunately, the problem was found within the 30 days. NCIX support was nice enough to cross ship a new power supply at no extra cost. I think twice before choosing a another Seasonic product in the future.

Experience: 2 Weeks


Quiet, Modular
I bought this to use with the Silverstone FT-02 case. The orientation of the components were different from a regular case so that was worrying according to some reviews. Everything appears to be fine though, so that's great. There was a ticking sound at the beginning though and that was rather worrying... it could've something hitting the fan in that position but it's gone now

Experience: 1 Weeks


packaging blew me away!
Made good use out of the 2 pouches: heavy duty nylon and felt material!
Oh yeah the PSU works great.
Modular cables are wonderful
Price, but it is the top of the line.
PSU fan does not spin when system not under huge load - assuming it does when more power is drawn, so far the PSU hasn't generated much heat (room temp) while my comp sits at idle.

Ideal for durability and silence. I had a deal on it so I was considered lucky for what I got it for.

i7 2700k
gtx 560ti factory OC
16gb ram corsair vengence
asus p8z68-v pro gen3 mobo
2 hhds

Experience: 5 Days


good quality
gold certified
most reliable power supply
modular cables are not covered completely
more expensive then most of the power supplys
i would recommand this power supply for anyone that needs a good , strong and reliable power supply .

Experience: 14 Days


modular cable management
It is easy to add cables when needed with the modular design.
i did not stress the PSU near to his limit but it seems to have no problems of stability. it handles with ease a 2600K, z68 mobo, 16gb ram, 4 hdd, and a 460 GTX.
Lots of power for upgrading

Product Videos [ Edit ]

Features [ Edit | History ]


The very first full modular multi-output ATX, high-wattage power supply that has ever obtained the 80PLUS Gold certification is introduced by Seasonic, this coveted power supply is named "X" and is offered in 560W versions.

Featuring a patent pending design of "DC Connector Module with Integrated VRM", the X Series is set to achieve both near-perfect DC to DC conversion and fully modularized design without compromising efficiency. After a long wait, finally there is a product that delivers the complete package, ultra-high efficiency, greatly improved dynamic response, and customizable cable arrangement that is tailored to meet any individual's needs.

Quick Specs:
Compatibility Multi-GPU Systems
Efficiency 87%
Input Voltage 110 V AC 220 V AC
Output Power 850 W
Limited Warranty 5 Year
Output Voltage 3.3 V DC @ 25 A 5 V DC @ 25 A 12 V DC @ 70 A -12 V DC @ 500 mA 5 V DC @ 3 A
Form Factor Internal
Height 3.4"
Width 5.9"
Depth 6.3"
Number of Fans 1
Green Compliant Yes
Green Compliance Certificate/Authority 80 Plus Gold WEEE RoHS
NVIDIA SLI Supported Yes
Number of +12V Rails 1
Modular Yes

Specifications [ Edit | History ]

General Information  
     Brand Name: Seasonic
     Manufacturer: Sea Sonic Electronics Co., Ltd
     Manufacturer Part Number: SS-850KM
     Manufacturer Website Address:
     Product Model: X-850
     Product Name: X-850 ATX12V & EPS12V Power Supply
     Product Series: X
     Product Type: Power Supply
     Receptacles: 1 x 20+4pin ATX Motherboard
1 x 4+4pin ATX12V Motherboard
1 x 8-pin EPS12V Motherboard
4 x 6+2pin PCI-E
8 x Serial ATA
2 x 4-pin SP4 Floppy Drive
8 x 4-pin LP4 Peripheral Device
     Compatibility: Multi-GPU Systems
     Green Compliance Certificate/Authority: 80 Plus Gold
     Green Compliant: Yes
Physical Characteristics  
     Depth: 6.3" (160 mm)
     Form Factor: Internal
     Height: 3.4" (86 mm)
     Width: 5.9" (150 mm)
Power Description  
     Input Current: 10 A @ 110V
5 A @ 220V
     Input Voltage: 110 V AC
220 V AC
     Input Voltage Range: 90 V AC to 264 V AC
     Input Voltage Type: AC
     Number of +12V Rails: 1
     Output Power: 850 W
     Output Voltage: 3.3 V DC @ 25 A
5 V DC @ 25 A
12 V DC @ 70 A
-12 V DC @ 500 mA
5 V DC @ 3 A
Technical Information  
     Efficiency: 87%
     Modular: Yes
     Number of Fans: 1
     NVIDIA SLI Supported: Yes
     Power Factor Correction (PFC): Active
     Specification Compliance: ATX12V/EPS12V
     Limited Warranty: 5 Year

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Reviews from the Web

Below are reviews found on other web sites for this product submitted by customers.

Posted by: TheBigTroll1226 @04/04/13
Comment: A minor issue with this product, in our opinion, is the relatively reduced number of SATA power connectors (eight), especially when there are some high-end 850 W units out there offering 12 of them. It would also be nice if the manufacturer had added six video card power connectors instead of “only”
Posted by: Andrew_S @01/16/11
Submit a review link   |   Latest 30 reviews

Product Warranty

1 year limited warranty through

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