Seasonic Platinum-1000 1 Kilowatt Power Supply Review

Seasonic breaks the Platinum efficiency barrier with its new 1 kilowatt computer power supply. We generally know if it has Seasonic branding, it is a good PSU. But we all want to know if it is a great PSU. We all know that Seasonic means "quiet" as well and believe it or not this PSU can be dead silent.

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Build Quality

As we already know the Seasonic Platinum-1000 features a single 120mm fan design that has come to be the preferred standard for quiet cooling environments, which Seasonic has been the longtime leader in, due to the ability to move a larger volume of air at slower speeds than a smaller diameter fan. While great for quiet computing environments the key criteria in our evaluation is whether or not the cooling solution is sufficient, not necessary it’s sound level or form factor.

External Build Quality

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In form, the Platinum-1000 resembles the X-Series units we have seen before. In finish, it varies a bit given the emphasis on the 80Plus Platinum rating. The unit's three piece housing is a mix of the traditional rugged black finish we have come to expect from Seasonic and accent pieces of platinum with the same rugged finish. The front of the unit is fully modular as before, but there is a switch now to change fan modes. Wait? The switch is on the front of the unit? So it is going to be inside your case? Really? What if I want to change the setting so that it is fanless at low load or vice versa? I have to open my case to do that? Why not just locate the switch on the rear of the unit so I can change it from the outside? Will I do the rest of this review in a question format? No.

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The Seasonic Platinum-1000 comes in at a total length of ~7 3/8 inches while the cables all reach out to ~21 to 26 inches to the first or only connector. The modular cables are all well (completely) sleeved in black mesh which is nice to see.

Internal Build Quality

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Once we open the Platinum-1000 we are left looking at a unit that is very similar to the Seasonic X-Series units have reviewed before. The heatsinks continue to be like the later model X-Series units we reviewed and the fan is a Sanyo Denki fan rated at 0.19A at 12v. When we flip the PCB over, we see the physical layout has changed from the X-Series units a bit but the basic design is very similar. We also see that the already clean layout and soldering has improved a bit.

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As we start off with this unit, we see the input filtering begins on the housing and then moves to the main PCB. Amongst the input filtering, we see a heatsink to which the bridge rectifiers are attached. Continuing on around, we see that this unit differs from previous X-series units we have reviewed a bit in that the primary layout has changed. The APFC and primary side power components have changed from being attached to one long heatsink on the side of the PCB to two smaller heatsinks. The input capacitors have also moved to the edge of the PCB by the modular interface and there are now three of them. These capacitors are provided by Nippon Chemi-con and are rated at 420v 330uF 105C.

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On the "secondary" side, we see that the layout is again similar to the later revision X-Series units we have reviewed. Before getting directly over to the secondary side, we see a pair of headers in the middle of the PCB. These headers are for the fan controller and the fan switch itself. The secondary capacitors are again all Nippon Chemi-con capacitors and the majority of these are solid capacitors (including those on the DC-DC VRM). We see those DC-DC VRM's when we swing over to the front of the modular PCB and look at the upper half of the PCB. This part of the interface houses all of the connectors that require the minor rails voltages, 5v and 3.3v, plus one modular connector for either a PCI-Express connector or an EPS connector for some reason. These connectors include the Molex, SATA, and the portion of the motherboard connector with 3.3v/5v leads. This portion of the PCB is once more fed by a few 12v leads and grounds while the bottom half of the modular interface PCB houses only components that use 12v and ground leads. These particular leads are fed by angled metal connections from the main PCB as opposed to wires.

Build Quality Summary

As has been the case ever since Seasonic released power supplies based on the X-Series design, the build quality of the Platinum-1000 is outstanding. The exterior of the unit features Seasonic’s typically good quality finish but it is trimmed out this time in both black and platinum in a nod to the unit's name as well as claimed 80Plus efficiency. The cables are once more all modular and of excellent construction and sleeving. Once we move to the interior of the unit, we again see an excellently built power supply. The full bridge/LLC DC-DC design of this unit is excellent and is stocked with high quality components such as Nippon Chemi-con capacitors and a Sanyo Denki fan. The unit's actual integration is excellent as well and the soldering is actually a bit better than we have seen on some of Seasonic's other very well built power supplies. Let’s move on now and see how Seasonic has improved upon its X-Series design with this new spin.