---
product_id: 1478247
title: "Seasonic X-850(SS-850KM3 Active PFC F3) 850W 80 Plus Gold ATX12V/EPS12V Power Supply"
brand: "seasonic"
price: "€ 459.53"
currency: EUR
in_stock: true
reviews_count: 5
url: https://www.desertcart.fi/products/1478247-seasonic-x-850-ss-850km3-active-pfc-f3-850w-80
store_origin: FI
region: Finland
---

# 850W Power 80 Plus Gold Full Modular Seasonic X-850(SS-850KM3 Active PFC F3) 850W 80 Plus Gold ATX12V/EPS12V Power Supply

**Brand:** seasonic
**Price:** € 459.53
**Availability:** ✅ In Stock

## Summary

> Power Up Your Performance! ⚡

## Quick Answers

- **What is this?** Seasonic X-850(SS-850KM3 Active PFC F3) 850W 80 Plus Gold ATX12V/EPS12V Power Supply by seasonic
- **How much does it cost?** € 459.53 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/1478247-seasonic-x-850-ss-850km3-active-pfc-f3-850w-80)

## Best For

- seasonic enthusiasts

## Why This Product

- Trusted seasonic brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Robust Reliability:** Backed by a 5-year warranty for peace of mind.
- • **Future-Proof Design:** Full modular cabling allows for easy upgrades and clean builds.
- • **Unmatched Efficiency:** Experience 80 Plus Gold certification for superior energy savings.
- • **Versatile Compatibility:** Universal AC input supports a wide voltage range for global use.
- • **Whisper-Quiet Operation:** Enjoy a silent computing experience with advanced fan control technology.

## Overview

The Seasonic X-850 is an 850W power supply that boasts 80 Plus Gold certification, ensuring high efficiency and reliability. With features like full modular cabling, advanced fan control, and a wide input voltage range, it’s designed for both performance and convenience, making it an ideal choice for modern PC builds.

## Description

SeaSonic X-850 850W 80 Plus Gold ATX12V / EPS12V Power Supply. False Anti-surge Shutdown Issue: The built-in anti-surge feature on some motherboards is known to produce false-positive readings while monitoring the output voltages of the power supply. Seasonic power supplies have their own integral safety features to protect all the components against electrical damage. When your system shuts down due to this problem in the motherboard, please follow these steps: 1. Update the BIOS of your motherboard to the latest version available. 2.Check the power supply’s output readings in the BIOS. 3.If all seems to be normal then turn OFF your motherboard’s anti-surge protection. 4.To make sure that everything runs properly, you can check your benchmark scores (Futuremark, OCCT, etc.)

## Features

- 80PLUS Gold Certified Super High Efficiency Seasonic DC Connector Module with Integrated Voltage Regulator Module DC to DC Converter Design
- Conductive Polymer Aluminum Solid Electrolytic Capacitors Active Power Factor Correction (99% PF Typical) High +12V Output
- Ultra Ventilation (Honeycomb Structure) Full Modular Cabling Design All-in-One DC Cabling Design Easy Swap Connector
- Total Power: 850 W Power Factor Correction: Active PFC, 99% typical
- Input Voltage: Full Range- 100 - 240V (Max. 90 - 264V) Input Frequency Range: 50/60 Hz
- Input Current: 10 - 5A
- Seasonic Hybrid silent Fan Control Sanyo Denki - San Ace Silent Fan
- Universal AC Input (Full Range) 5 Years Warranty

## Product Details

- **Brand:** Seasonic
- **Compatible Devices:** Personal Computer
- **Connector Type:** ATX, EPS
- **Output Wattage:** 850 Watts
- **Form Factor:** ATX
- **Wattage:** 850 watts
- **Cooling Method:** Air
- **Item dimensions L x W x H:** 6.3 x 5.91 x 3.39 inches
- **Item Weight:** 3 Kilograms
- **Power Supply Design:** Full Modular

## Images

![Seasonic X-850(SS-850KM3 Active PFC F3) 850W 80 Plus Gold ATX12V/EPS12V Power Supply - Image 1](https://m.media-amazon.com/images/I/71L68MsFWBL.jpg)
![Seasonic X-850(SS-850KM3 Active PFC F3) 850W 80 Plus Gold ATX12V/EPS12V Power Supply - Image 2](https://m.media-amazon.com/images/I/61RrqarveXL.jpg)
![Seasonic X-850(SS-850KM3 Active PFC F3) 850W 80 Plus Gold ATX12V/EPS12V Power Supply - Image 3](https://m.media-amazon.com/images/I/61zsN8j-lsL.jpg)
![Seasonic X-850(SS-850KM3 Active PFC F3) 850W 80 Plus Gold ATX12V/EPS12V Power Supply - Image 4](https://m.media-amazon.com/images/I/712bnKvjfLL.jpg)
![Seasonic X-850(SS-850KM3 Active PFC F3) 850W 80 Plus Gold ATX12V/EPS12V Power Supply - Image 5](https://m.media-amazon.com/images/I/611kLswUvNL.jpg)

## Questions & Answers

**Q: Can someone confirm if this has the switch on the connector side for fan control. There is a newer version called SS-850KM3 that would also be printed on the label. I really want the new version with fan control switch based on recent reviews. Newegg still listed it as the old model but when I asked they suddenly updat…**
A: Yes, this model does have the switch that allows you to toggle between Hybrid Silent Fan Control and Normal modes.  I also confirmed on the label that it is the SS-850KM3 version.  Enjoy!

**Q: Does this power supply have 2 6 pin and a 8 pin connections for a gtx 980 ti?**
A: Yes it does.  Each of the (four, I think) PCIe power cables have 2x 6+2 pin connections.  (I have this same PSU and GTX980Ti and it works great)

**Q: Is this fully modular?**
A: Yes it is. So, far the power supply has been running like a champ.

**Q: How well will this work for an office server setup (xeon/file share/exchange/etc)? In terms of performance and reliabilty...**
A: If it works with your motherboard, I recommend it for its conservative ratings and stable outputs. See HardOCP's PSU reviews on Seasonic. Good through testing there and Seasonic X series do very well.Powers my i7 to 4.5 GHz with 32 GB of RAM and two gtx 580 over clocked SLI cards all watercooled.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Still going strong after 8 years
*by A***G on July 3, 2025*

Still going strong after 8 years. Has powered two builds so far (R7 1700 + GTX 1070 to R7 9700X + RTX 5060 Ti). It's pretty quiet and is pretty much the one of the few parts that survived my PC upgrade.

### ⭐⭐⭐⭐⭐ Great power supply, sorry for my drunken rant.
*by S***. on February 25, 2017*

Seasonic is well known to make power supplies with high end components such as Nippon Chemicon, capacitors from Japan, durable Sanyo San Ace dual ball-bearing fan, excellent input filtering, regulation, and overall premium build quality. Currently for the last 15 years Seasonic has been my primary brand of power supplies I would use for my builds as well as my friends and family. With the crazy weather we've experienced the last few months, it's not uncommon for us to experience brown outs or intermittent black outs. Even after all of the electrical problems in my neighborhood my 2 machines running both the Seasonic X-850 and Seasonic Platinum 760 are still holding up quite nicely. Since my Platinum replaced a competitor's product (one with a sail) that failed last summer, I've been migrating all of my equipment to UPSs for battery backup and additional protection. That said, owning a UPS does NOT guarantee reliable operation of a power supply. Case and point, last night a longtime good friend of mine called up from out of state for assistance troubleshooting his PC that refused to power back on after a power outage. He had his machine connected to a battery backup, lost power then proceeded to power off his equipment. After utility power came back on, his PC refused to power on or POST. After some basic troubleshooting, I've had him disconnect the power supply from his components and short the green pin to a black pin on the ATX24 connector to manually power on. No dice, the fan didn't spin. To verify once more, I had him use his multimeter to read the DC rails, Yellow for 12v, Red for 5v, and orange for 3.3v; only the 3.3v rail output anything. It's dead Jim. He also did not use a Seasonic Power supply, instead he opted for one that was on sale at a big box store.The point of the story being, his Non Seasonic power supply was approximately 4 years old when it died past it's warranty, and my dead corsair also lasted a little past it's 3 year warranty. As for Seasonic, since 2002, I've owned a few of their units. None has come to mind that has failed on me yet. I've also given away an old 620W 80plus model I've purchased in 2006 that's still kicking to this day confined in a desk cubby with inadequate air flow.I can babble on for hours about how great this unit is on efficiency, how quiet it is, build quality, rail quality, customer service, etc.But here's what it boils down to:"How reliable is this unit?" Very reliable. "What happens if this fails?" Contact Seasonic, they'll ship you a replacement unit. Also this won't kill motherboards and components like the Bestec power supplies did. (Look that one up guys)"Why buy this when I can buy 100000W brand XYZ power supply for half as much?" When you spend $300+ for a CPU, $400 for a GPU, $150 for a case, you can budget some money in a quality power supply that will easily outlast your video card in terms of functional use. Go ahead, save some money, buy a cheap crap PSU, but don't cry when your expensive part fails.

### ⭐⭐⭐⭐⭐ Spot on 850w of power ss-850km3
*by D***O on February 21, 2014*

I'd replaced two thermaltake psu's in the past that just quit. Finally replaced them with a 650w antec (antec are rebranded seasonic) and never had a issue since. So for my new build, I purchased this PSU. Plenty of power for my build:i4770k 16gb - ASUS maximus VI heeroGTX7804x SCSI3 HDD's1x SATA2x opticalThe gold rated efficiency claim I tend to view more as marketing since psu mfg's police themselves, besides, efficiency ratings only matter for over 80% utilization. I don't expect to be taxing the psu that hard all the time (the one 2star review, I don't think 850w is enough for his kit). For me, the quality of the power is what counts. I use a psu tester always before plugging it onto my mb. This unit was solid spot on for all voltages except one plug was 11.9v. Within spec, but there's enough connectors that I can not use that and have plenty to spare. If I add so much hardware I'm actually using all the connections on the psu, I should be buying a bigger psu.It's very quiet. I have mine on normal mode, I don't see a need to go to fanless mode.It's fully modular and comes with a nice sleeved mb power cable, and plenty of black power cords for most anyone. The mb and cpu power cables are long enough to route through a thermaltake A71 full tower with slack to spare connected to a ASUS maximusVI hero full size atx board. Quality of power, ease of installation, and number of connectors are all excellent.A bonus is the bags for the cables that it comes with, and the bag the psu is packaged in. Rather than a rats nest of unused cables, you can keep your spare parts organized, the velvet bag will be stuffed with extra cables in my parts box.The only con would be, for me, is that it is a single rail psu. Single rail psu's mean you don't have to balance the load on the psu, but I'm used to that. Since most psu's now are all single rail, I'll have to grin and bear it.I've been around the block the last 20 years building and supporting machines for a living, electronics fail, fact of life. In my experience though, if it passes burn in, I expect this unit to be as rock solid as any seasonic psu. It's smaller, lighter, made in china, but what isn't nowadays. The one good thing is that seasonics have always been made in china, so I'm pretty confident they know how to make a power supply. Any unexpected failures down the road and I'll update this, but if I need another power supply for another build, I'll be buying a seasonic again.

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-09*