Seasonic PLATINUM-1050 Power Supply Review

Seasonic is one of our long-time favorites when it comes to truly high-end power supplies. The new PLATINUM-1050 PSU claims to deliver excellent power efficiency and does so with a fully modular design. Seasonic is often known designing products with excellent sound profiles. Does the PLATINUM-1050 fit the profile?

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Overview

The first thing we are going to look at with the Seasonic PLATINUM-1050 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.

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The packaging of the Seasonic PLATINUM-1050 is the same as what we saw for the PLATINUM-1200 before, save for the particulars that refer to this unit’s power outputs. As such, there is very little new to see here today. As typical for these units, we find an 80 Plus Platinum seal on the front of the packaging (a quick check of the 80 Plus website does indeed find the unit certified for 80 Plus Platinum) along with a stylized picture of a Seasonic power supply. When we flip to the rear of the packaging, we find most of the same advertising that we saw on the PLATINUM-1200 including information about the fan controller, some voltage regulation claims, design points, and the fact that the unit is backed by a 7 year warranty. On the sides of the packaging, we find the power label (reproduced below) and the connector count (reproduced below).

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The power information for the Seasonic PLATINUM-1050 is much as we expect from modern units and very similar to what we saw from the PLATINUM-1000 and PLATINUM-1200. Seasonic claims that this is a single 12v rail unit with a peak 12v capacity of 87A or ~99% of the unit’s total possible capacity if necessary. When we look at the minor rails, we see that these are capped at 125W and each rail is individually capable of 25A, which is the same as what we saw with the PLATINUM-1000. This makes the entirety of the difference between the two units so far the 4A difference on the 12v rail. Moving on, we find that the PLATINUM-1050 has 8 modified 8-pin PCIe connectors, 5 Molex connectors, and 14 SATA connectors. This is a rather significant change from what we saw with the PLATINUM-1000 as we get 2 more PCIe connectors and 3 more SATA connectors. With that being the case, this unit should be able to physically support more multi-GPU configurations than the previous PLATINUM-1000 and it should also be able to support the vast majority of RAID arrays or peripheral needs.

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Once we open the PLATINUM-1050, we find the usual assortment of items that come with a Seasonic power supply including the power supply in a bag, mounting screws with Seasonic case badge, zip-ties, modular cables in a bag, the power cord, the user manual, and the warranty card. The user manual that comes with the PLATINUM-1050 covers this model as well as the 1200W, 860W, 760W, 660W, Fanless 520W, Fanless 460W, and Fanless 400W models. It is 52 pages long in eight languages. Included in the manual is the power table for all of the current Platinum units, the connector counts for all of the current Platinum units, installation instructions, some troubleshooting instructions, and the warranty information. On the power table for the unit, we find the operating temperature is listed as 50C. Overall, the manual is once more very serviceable and very good.