Seasonic Platinum-1200 Power Supply Review

Seasonic is one of our longtime favorite brands when it comes to enthusiast computer power supplies. Its new 1,200 watt powerhouse still outshines many PSUs that it competes with. Interestingly enough Seasonic's biggest true competition seems to be... well... Seasonic.

continued...

Overview

The first thing we are going to look at with the Seasonic Platinum 1200 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 Article Image

The packaging of the Seasonic Platinum 1200 is the same as what we saw for the Platinum 1000 before (save for the particulars that refer to this units power outputs). As such, there is very little new to see here today. Once more, 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) and that is about it there. When we flip to the rear of the packaging, we find most of the same advertising that we saw on the Platinum 1000 including information about the fan controller, some voltage regulation claims (though these are advertised as being tighter than the previous Platinum 1000), 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).

Article Image

Article Image

The power information for the Seasonic Platinum 1200 is much as we expect from modern units and very similar to what we saw from the Platinum 1000. Seasonic claims that this is a single 12v rail unit with a peak 12v capacity of 100A or ~100% 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. Moving on, we find that the Platinum 1200 has 10 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 4 more PCIe connectors and 3 more SATA connectors. With that being the case, this unit should be able to physically support almost all multi-GPU configurations and the vast majority of RAID arrays or peripheral needs. Then again, if it is a quality 1200W unit that should have been a given to begin with.

Article Image Article Image Article Image

Once we open the Platinum 1200, 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, modular cables in a bag, the power cord, the user manual, and the warranty card. The user manual that comes with the Platinum 1200 covers this model as well as the 1000W, 860W, 760W, 660W, Fanless 520W, Fanless 460W, and Fanless 400W models. It is 54 pages long in eight languages. Included in the manual is the power table for all of the Platinum units, the connector counts 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 but interestingly the fanless models are listed at only 35C. The Platinum 1200 is rated for full power at 50C. Overall, the manual is once more very serviceable and very well put together.