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Seasonic X-Series 850W KM3 Power Supply Review

The box artwork has been changed since the KM2, although the overall concept keeps the same colour scheme and understated ethic.

The supply is shipped protected between foam panels and is wrapped in a felt bag. We see very little possibility it could get damaged in transit.

Seasonic include a user manual, plastic and felt cable ties, alongside mounting screws. The cables are stored inside a two pouch bag, which can be reused. A regional specific power plug is also included.

Seasonic have changed the cabling to the popular ‘flat' ribbon style which can ease the routing phase and improve system airflow. They are still using high grade 18AWG cables, which is good to see.

The configuration of cables has changed. The older KM2 model had 4x PCI-E 8/6 Pin connectors, the new model ships with x6 of these headers. This is more than adequate, even for the most demanding SLI and Crossfire system builds.

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6 comments

  1. They do rock, no doubt about it !

  2. Very nice indeed. id like to see a review of their 650W or 750W, 850W is a bit overkill for me…… coming soon?

  3. I like the sleeved cables 🙁 didnt know people like the flat ones more…..

  4. @ Mannucuna.

    Flat cables are better for routing, some cases have problems housing the fatter cables behind the motherboard tray. I do agree however, the sleeved cables look better, but most people dont want to be looking at them… especially in a windowed case. Its an industry wide move, Seasonic were slow to adopt them.

  5. its confusing because most of the stores dont list these as KM2 or KM3, its a complete guess when they dont include images or detailed information,. they should clearly mark these R3 on the box on the front.

  6. Yes the marketing is confusing. newegg has been shipping the for a while but had the images of the KM2 model.

    Minor nitpick about the review. It says “four OCP channels, two for +12V, one for +5V and another for +3.3V”

    which makes it sound like it is a two rail PSU. I believe it is a single rail and, like its predecessor, one of the two 12V OCP channels isn’t populated or used.