Seasonic SS-350TGM Power Supply Review

Today we tackle something a bit off the beaten path for us; a low power non-ATX specification power supply from Seasonic. We do know that many of our readers build systems that are not like all the others especially when it comes to crafting smaller purpose driven boxes. The 300TGM may be just what you are looking for.



The first thing we are going to look at with the Seasonic SS-350TGM is its packaging, accessories, and documentation. While normally none of these items is a make or break item for a power supply the packaging quite often contains a lot of information about the product we are purchasing. The inclusion of an owner’s manual that provides actual information about our product is also of great help. Accessories are almost unnecessary with a power supply as the unit is self contained, unless it is modular, but there are cases where a manufacturer can include useful accessories to make installation, routing, and use more efficient.

Right now, the Seasonic SS-350TGM appears to be an OEM only product (though listed on Seasonic's website as if for sale) so if you happen to come across one don’t expect to get retail packaging. Indeed, ours arrived in a shipping container with just bubble wrap. Given that there is no information on the "packaging" that comes with the unit we turn to the Seasonic webpage where we find that the unit is supposed to be certified for 80Plus Gold and not a whole lot else. A quick check of the 80 Plus website reveals that the SS-350TGM is indeed certified for 80 Plus Gold. One of those things that is kind of important but not mentioned so far, since there is no supporting documentation with this unit, is the warranty. Some digging on Seasonic’s website find this:

We proudly stand behind our products up to 3-year product warranty.

Seasonic offers a limited warranty against manufacturing defects for a period of up to 5 years from original date of manufacture (effective date starts on November 2007 with 5- years-warranty sticker). The warranty is null and void if the product is opened or modified in any way by personnel not authorized by Seasonic.

The website also says though:

However, neither of these contradictory claims indicates if this is true for the OEM products which are also listed as being generally available on the Seasonic website. Typically, OEM products carry shorter warranties than retail so the 3 year (or what seems like a default of 5 year now) length seems to be a bit doubtful based on industry practices. The fact that Seasonic does not specifically state the length of this warranty, and the fact that the default fall back information gives two different lengths, is certainly not good at all if consumers start using these units en masse.

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The power information for the Seasonic SS-350TGM is consistent with what we have seen from modern power supplies, though on just a 350W scale. While the total 12v capacity is ~99% of the unit’s output it is "just" 29A, again since the unit is just 350W in total capacity. This is split across a pair of 12v rails that are broken down per the ATX12v specification for power supplies (one 12v rail feeds the CPU while another feeds everything else). When it comes to the minor rails we see these have total capacity of 80W and the 5v rail has a possible output of 16A while the 3.3v rail has a possible output of 12A (the combined output of both at any given time is still limited to 80W total). The connectors that come paired with all of this consist of 1 P4/AUX, 2 Molex, 1 Floppy, and 4 SATA. Given the other power information presented, the unit probably could support a single 6 pin PCI-E connector which would make it more useful for people other than OEM’s particularly for people looking to use this in a HTPC. Maybe we'll see that later if Seasonic revises this unit.

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When we open the Seasonic SS-350TGM packaging all we see are the power supply, the modular cables, and the power cord. This is an OEM PSU after all. Let’s move on to the actual unit itself and see what we have going on there.