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.
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This Item  Seasonic X-850(SS-850KM3 Active PFC F3) 850W 80 Plus Gold ATX12V/EPS12V Power Supply |  |  |  |  |  | |
| Price | $198.02 | -24% $129.99 Typical: $169.99 | -25% $134.99 List: $179.90 | -10% $179.99 List: $199.99 | -27% $109.99 List: $149.99 | $99.99 |
| Delivery | Get it May 3 - 8 | Get it May 6 - 10 | Get it May 6 - 10 | Get it as soon as Friday, May 3 | Get it as soon as Friday, May 3 | Get it as soon as Friday, May 3 |
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| Sold By | iT Hardware | FlashDeal Store | FlashDeal Store | Amazon.com | Skytech | Amazon.com |
| power supply design | Full Modular | Full Modular | Full Modular | Full Modular | Semi-Modular | Full Modular |
| connector type | ATX, EPS | ATX | ATX | SATA | ATX | ATX |
| form factor | ATX | ATX | ATX | ATX | ATX | — |
| cooling method | Air | Air | Air | Air | Air | — |
| fan count | 1 | 1 | 1 | 1 | 1 | 1 |
| wattage | 850 watts | 1000 watts | 850 watts | 1000 watts | 850 watts | 750 watts |
Reviews with images
This is a great power supply for almost any build
This is a great power supply for almost any build, it is somewhere between a tier 1 or 2 . not too loud, has adequate power and comes with more cables than you will need. cable lengths were perfect for my midsize tower build, the only thing i would have preferred would have been if the cables were sleeved vs being a ribbon type, but that is more of a cosmetic thing than an actual flaw. efficiency has been great while i monitored it with my watt meter especially since my pc only draws around 330 at full load. it fits in most standard cases and it a well trusted brand with many great reviews.
Top reviews from other countries
lose antonio
he tenido que mandar a reparar por que nò funciona,
Reviewed in Spain on June 16, 2015Damian Jopling
Excellent results for overclocked / high occupancy systems.
Reviewed in the United Kingdom on June 23, 2012