Seasonic Platinum-660 660W Power Supply Review

Seasonic's new SS-660XP comes to us boasting high end PSU features in what we can consider a smaller wattage package than what we are used to seeing. This PSU has a fully modular design, great efficiency, optional Hybrid fan control allowing fanless, silent, and normal cooling modes. Does Seasonic have another winner?

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Overview

The first thing we are going to look at with the Seasonic PLATINUM-660 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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Having seen both the X-660 and the PLATINUM-1000 before, the form and much of what we find on the packaging of the PLATINUM-660 is familiar. With the front of the packaging, we find a lot of platinum and an 80 Plus Platinum seal. A quick check of the 80 Plus listings does indeed find that this unit is certified for 80 Plus Platinum efficiency. With nothing else of note on the front of the packaging, we move to the rear where we find mostly marketing points, that we have seen before, and a fan noise graph as we have seen before on other Seasonic units that share this same fan controller. Finally, on one of the sides, we find the power label (reproduced below) and connector count (reproduced below). Lastly, the unit is covered by a 7 year warranty as we have seen before from Seasonic’s top of the line units previously and this is very generous.

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The power information for the Seasonic PLATINUM-660 is almost identical to what we saw from the X-660. The only real difference is the total 12v capacity has moved from 54A to 55A today or now up to ~100% of the unit’s possible output if needed. The connector arrangement is also very similar to what we saw on the X-660 except that we add 2 SATA connectors and 1 EPS connector. All in all, this gives us 2 EPS connectors, 10 SATA connectors, 5 Molex connectors, and 4 modified 8 pin PCI-Express connectors. So, like with the X-660 before it (while not rated for SLI at this time), this unit likely could run a number of SLI setups as well as support about as many peripherals as most users would ever need in this wattage footprint.

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Once we open the PLATINUM-660, 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 warranty card. The user manual that comes with the PLATINUM-660 is 52 pages long in eight languages. Included in the manual is the power table for all units in the PLATINUM series, the connector count for all units in the PLATINUM series, installation instructions, some troubleshooting instructions, etc. We don’t find a derating curve, but we do find that the units that are not fanless are rated at 50C while those that are fanless are rated at just 35C. The included warranty card also provides the warranty information, terms, and how to submit an RMA. Overall, the manual is much better than the manual we recently saw with the G-550 and more like what we used to see from Seasonic.