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The Seasonic X-Series 850W power supply is just as impressive as the 1250W model which we reviewed a couple of weeks ago. That said, an 850W Power supply makes a lot more sense for a much wider audience, especially as this unit can handle an extended load of 1,000 watts. Not often have we tested an 850W power supply that can sustain a 1,000W load.
Aesthetically we like the appearance of the X-Series 850W. The black paint is deep and difficult to scratch, although it does attract finger prints fairly easily.
The plain black appearance will suit a broad range of systems and we prefer the subdued black fan grill, compared against the bright gold version on the 1250W model.
Technically there are no weaknesses with this design. It delivers high levels of efficiency while maintaining strong noise suppression. The +12V output peaks at 30mV under full load and +3.3V/+5V peak at 15 mV under the same conditions.
The high grade Sanyo Denki San Ace fan is generally inactive below 450W, kicking in harder in the last 200W of total rated output.
The modular design is excellent and Seasonic supply a plethora of high grade sleeved cables which are long enough to be compatible with a tower design chassis.
I was slightly disappointed that the power supply has only 4 PCI E 6/8 pin connectors and cables. With the high level of power output and strong regulation, we feel another two cables could have been added without forcing a reliance on adapters.
We have no hesitations recommending this power supply, it is available from ARIA for £150 inc vat. An ideal choice for an ultra high end enthusiast gaming system.
Pros:
- Excellent build quality.
- Modular design.
- quiet, quality fan.
- efficient.
- stable load regulation.
- can deliver over 1,000Watts!
Cons:
- expensive.
- only 4 PCI E connectors.
Kitguru says: Another winning design from Seasonic.
Perfect for my new system build next month – big question. no stock anywhere? maybe ill get the corsair 😉
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
even OCUK have them all listed as pre-order.
nice 🙂
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.
@ Darth Digglers, the HX850 you linked is a CWT built PSU, the AX850 uses the Seasonic X series design.
opps, yeah well spotted, sorry if I misleaded anyone. both good power supplies though from corsair at a good price.
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.
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.
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.