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Seasonic X-Series 850W Power Supply Review

The Seasonic X-Series 850W supply is a plain design with a black finish and stickers on the sides of the chassis. The paint work is deep and it will fit into a variety of systems without problem.

The 120mm fan is hidden behind a black grill. We will take a closer look at this later in the review.

One side of the power supply is fully vented to improve air flow. At the side is a power switch and connector.

The X-Series 850W has several rows of ports for the modular connectors. These are all clearly labelled to avoid confusion. There is a sticker bottom which indicates that the fan will only spin when a certain temperature threshold is met.

Seasonic X-Series 850W Power Supply
DC Output
+3.3V
+5V
+12V
-12V
+5Vsb
Max Output
25A
25A
70A
0.5A
3A
Total Power 125W 840W 6W 15W
850W

70A can be delivered to the +12V rail, plenty of power on tap for demanding gaming systems.

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10 comments

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

  2. 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

  3. even OCUK have them all listed as pre-order.

    nice 🙂

  4. 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.

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

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

  7. 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.

  8. 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.

  9. 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.

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