Seasonic M12 600w Modular PSU


When it comes to silent yet powerful PSU’s, Seasonic are always one of the first companies to be mentioned. In business for over 30 years, Seasonic certainly know what they are doing when it comes to manufacturing power supplies.

Just over a year ago Seasonic released their S12 line-up, with models ranging from 430w-600w. These units proved very popular with enthusiasts who wanted stable power along with low noise levels.

With more and more high powered units entering the market from a whole range of manufacturers its hard to stay with the same product for too long, and for this reason Seasonic have released a new range of modular power supplies labelled the M12 series. The M12 series has a total of 3 models: 500w, 600w and 700w, with the 700w model being Quad-SLI certified. Today I’ll be taking a look at the middle-of-the-range 600w model to find out if Seasonic can uphold their reputation for power and silence in one package.

What Seasonic say about themselves:
“Since the incorporation of Sea Sonic Electronics Co., Ltd. in 1975, we have maintained our focus on research and development and the production of quality power conversion products.

For the past decades, supported by cutting edge technology based upon a strong research and development team, Sea Sonic Electronics has provided timely and professional solutions to meet many of the IT industry’s requirements.

For the future, we will continue our philosophy of dedication, innovation, professionalism and 4G’s (Great Technology, Great Quality, Great Service & Great Price) in order to maintain our goal of continued long-term business partnerships and create “win-win” situations for our customers.”


Having never seen or reviewed a Seasonic product in the past, I wasn’t quite sure what to expect in the packaging department. Some manufacturers go for all-out ‘bling’, with others being more conservative and going for the professional look.

Seasonic M12 600w Packaging Seasonic M12 600w Packaging
Seasonic have chosen to keep things plain and simple, using inoffensive green and yellow colour scheme with a picture of the PSU on the front of the box. Flip the box over and we can see that Seasonic have printed some of the units most notable features. These include: up to 85% efficiency, voltage fluctuation of 3% or less, 3 year warranty, quiet dual fans and much more.
Seasonic M12 600w Packaging Seasonic M12 600w Packaging
On the side of the box Seasonic have placed a specifications sticker that details the amperage output on each of the M12’s rails. There are also illustrations on how the dual fan technology works along with a diagram of the modular cabling system.
Seasonic M12 600w Packaging Seasonic M12 600w Packagingq
The M12 is packaged in a single walled cardboard box and is protected from knocks and scratches by a bubble-wrap bag. Hopefully this will be enough to keep the unit safe from the perils of the most brutal couriers.

Included in the box are the following items:
• 4x Silver ATX screws.
• 1x Power cord.
• 1x M12 manual
• 1x Pack of modular cables
• 1x M12 600w PSU