Seasonic G-Series: G-550 Power Supply Review

The Seasonic G Series PSU is here for review in its 550 watt capacity and it looks to be a return to basics for the company with this being basically a "no-frills" unit that has been released without much fanfare. But the basics for Seasonic usually outline what you truly need in a PSU; reliable clean power with a low sound profile.

continued...

Overview

The first thing we are going to look at with the Seasonic G-550 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.

Article Image Article Image Article Image

Article Image Article Image

The packaging of the Seasonic G-550 follows the form of what we have seen from Seasonic with its X-Series units, but today we find this particular G-Series unit comes trimmed out in white, black, and gold. Starting things off, the only thing we find on the front of the packaging is the 80 Plus Gold seal. A quick check of the 80 Plus website does indeed find the unit certified for 80 Plus Gold. As the front of the package is barren, other than the 80 Plus badge, we flip to the rear of the packaging. On the rear, we find a lot of advertising that we have seen before and this advertising includes the fan controller information, some voltage regulation claims, design points, and the fact that the unit is backed by a 5 solid year warranty. Flipping to the sides of the packaging we finally are able to track down the power label (reproduced below) and the connector count (reproduced below).

Article Image

Article Image

The power information for the Seasonic G-550 is much as we expect from modern units. Seasonic claims that this is a single 12v rail unit with a peak 12v capacity of 45A or ~98% of the unit’s total possible capacity if necessary. When we look at the minor rails, we see that these are capped at 100W and each rail is individually capable of 20A. Moving on, we find that the G-550 has two modified 8-pin PCI-Express connectors, five Molex connectors, and six SATA connectors. This rather appropriate for a unit of this capacity and given the market segment this unit is filling most users should be satisfied with their connection options.

Article Image Article Image

Once we open the G-550, we find the power supply in a bag, modular cables, mounting screws with Seasonic case badge, some zip ties, the power cord, the user manual, and warranty card. The user manual that comes with the G-550 is 11 pages long in 10 languages and is completely useless! While the quality of Seasonic’s documentation has been going downhill of late, it is usually not this bad! Seasonic has really dropped the ball with this manual as it is quite literally a waste of resources. The warranty card at least is useful, so there is that. Let's move on, quickly.