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Seasonic X-Series 850W Power Supply Review

Rating: 9.0.

Recently we analysed the Seasonic X-Series 1250W power supply aimed at the ultra high end enthusiast market. Today we supplement that review with a look at the more cost efficient X-Series 850W model, priced around the £150 mark. This is a fully modular design which has achieved 80 Plus Gold Certification.

Seasonic are using high grade 105c Japanese capacitors with a focus on maintaining low noise levels regardless of the load situation.

In a similar fashion to the 1250W version, the X-Series 850W adopts a “Hybrid Silent Fan Control” design, which offers three distinct operation modes, fanless mode, silent mode, and cooling mode. The X automatically adjusts fan mode and speed according to the ambient temperature level. This brand new design not only optimizes heat dissipation, but also prolongs lifespan of the system by reducing unnecessary fan rotation.

Special Features –

  • 80PLUS® Gold Certified Super High Efficiency
  • Full Modular Cabling Design
  • Patented DC Connector Module with Integrated VRM [Voltage Regulator Module]
  • DC to DC Converter Design
  • Seasonic Hybrid Silent Fan Control
  • Sanyo Denki San Ace Silent Fan
  • Conductive Polymer Aluminum Solid Capacitors
  • Highly Reliable 105℃ Japanese Brand Capacitors
  • Tight Voltage Regulation [±3%]
  • Active Power Factor Correction [99% PF Typical]
  • High +12V Output
  • High Current Gold Plated Terminals
  • Dual Sided PCB Layout
  • Ultra Ventilation [Honeycomb Structure]
  • Multi-GPU Technologies Supported
  • All-in-One DC Cabling Design
  • Easy Swap Connector
  • Universal AC Input [Full Range]
  • 5 Years Warranty

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  • brian

    Perfect for my new system build next month – big question. no stock anywhere? maybe ill get the corsair 😉

  • Davis

    Just sent you an email complaining. I can’t buy any of this seasonic stuff anywhere in the uK. stopp reviewing their products until they get stock on stores. all either pre-order or out of stock. useless fing company

  • Manucuna

    even OCUK have them all listed as pre-order.

    nice 🙂

  • Darth Digglers

    just get the corsair, loads of stock http://www.scan.co.uk/products/850w-corsair-pro-series-gold-hx850-modular-psu-80-plus-gold-sli-crossfire-eps-12v-quiet-fan-atx-v231 cheaper too. £15.

  • Dan

    @ Darth Digglers, the HX850 you linked is a CWT built PSU, the AX850 uses the Seasonic X series design.

  • Darth Digglers

    opps, yeah well spotted, sorry if I misleaded anyone. both good power supplies though from corsair at a good price.

  • Sara

    An enjoyable review. Please would it be possible in future for the high resolution photos to be taken with a macro setting on the camera, where applicable, in the interests of improving focusing and sharpness.

  • Lucas Johnston

    add my name to the list of people interested but unable to buy. Great products, no one is arguing that. but can I buy any? I wanted the 1250W weeks ago and ended up paying extra for the corsair 1200i.

  • Pingback: WTS: i7 3770K; maximus v gene; seasonic x850 psu, dominator platinum 2400 rams; corsair 600t case()

  • Brice Fleckenstein

    Cons are wrong – there were 4 cables included with all of my X850 – 2 of them “single” PCI-E 6+2 the other 2 “dual” PCI-E 6+2 for a total of 6 connectors ALL capable of being used in 8-pin PCI-E connections.
    Expensive – not compared to other GOOD Gold-rated 850 watt power supplies like the EVGA G2, but definitely more than the cheap junk that often doesn’t handle RATED capasity and might not even MEET Gold standards much less hit near Platinum.

    I do with that Seasonic had continued with this model and NOT moved to a junk fancy-name “sleeve bearing” fan on their new Focus and Prime series – I won’t even LOOK at those series given the junk fan in them.