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Power Supply

SeaSonic X Series 850W 80+ Gold Certified Fully-Modular ATX Power Supply

( 4.8 Average / 33 Ratings )





Part #

(or) SS-850KM3
(or) SS-850KM-F3




850 Watts





Efficiency Certification

80+ Gold


+3.3V@25A, +5V@25A, +12V@70A, -12V@0.5A, +5Vsb@3A

PCI-Express 6+2-Pin Connectors


Completed Builds Using This Part

See All Completed Builds


Merchant Base Promo Shipping Tax Availability Total
SuperBiiz $139.99 -$15.00 $124.99+
15% off (up to $15) w/ promo code: CYBERBLKGOBBLE, ends 2015-11-30 23:59:59
Amazon $134.99 +FREE s/h In stock $134.99
( 9 new from $134.99, 8 used from $94.50. Last updated 1 hour ago. )
B&H $134.99 +FREE s/h $134.99
Newegg $149.99 -$10.00 +FREE s/h In stock $139.99
$10.00 mail-in rebate
NCIX US $159.99 In stock $159.99+
* Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.

Price History (Excluding Tax & Combo Deals) History:


from completed build Desert Thunder

Tier 1 rated Seasonic X Series X-850 850W 80 Plus Gold Certified Full Modular PSU. It’s whisper quiet, it comes with a 7 year warranty, and is more than enough for what I need right now. And if i should decide to SLI in the future, I should still be fine. The cables are nice and long (no problems reaching components in my new full tower case) and come in nice storage bags. This was the first PSU I have ever used that comes with flat cables.

from completed build Client Build: Operation Blackbird

The SeaSonic 850W was chosen for its reliability, and 80 Plus Gold rating. And frankly guys, in my experience, you can never go wrong with SeaSonic.

from completed build Cerberus

This power supply has been a breeze to work with. Handles all of my components without a problem, and has been entirely silent.

from completed build My Current Gaming build.

Tier 1, 850w, overkill, but it'll work forever.

from completed build My current build. V2

Best PSU on the market.

from completed build New Rig Fall 2015

Another great deal - new, but lacking original packaging, from Amazon warehouse. Anxiously waiting months to complete build to see if it worked, but happily, it did. Invested in a PSU tester, but the cables were incompatible (always a good idea if getting non BNIB PSU's, though!)