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Seasonic SS-1050XM (X-1050)

Although Seasonic’s XM subseries came out earlier than the above-discussed KM3, it is still being produced, so we’ll follow our traditional course of reviewing PSUs from lower to higher wattages.

We won’t dwell upon their packaging and accessories as they are identical to those of the KM3 PSUs and their predecessors.

We can only note that the packaging is individual for each model in the series: the wattage rating is printed right on the box.

Exterior Design

External differences from the lower-wattage X series products are not limited to the larger dimensions. Instead of a conventional punched-out fan grid we can see a cutout in the PSU case which is covered with a gold-colored plastic piece the fan is attached to. The plastic plate easily bends in if pressed with a finger. It’s got a honeycomb grid of vent openings which helps identify the PSU as a Seasonic product but is no good in terms of acoustic comfort. It is going to produce more aerodynamic noise at high speeds of the fan.

There are almost no free space on the panel with modular connectors since the increased wattage implies broader expansion opportunities.

Even the back view is different from the other X series models. The case is definitely longer here while the Power switch is larger.

As a matter of fact, the exterior design of this PSU, from the plastic detail with fan to the large Power switch and modular connectors, is identical to the Seasonic SS-1000XP. However, the overall style is unmistakably that of the X series.

Circuit Design

The interior design is similar to the Platinum-certified Seasonic we tested earlier. Compared to the Gold-certified models, the SS-1050XM (X-1050) seems to use elements of both newer (see above in this review) and older products on a somewhat larger main PCB.

The bottom and left of the photo correspond to the new KM3 series: the layout of the heatsinks with a daughter card in between, the filtering chokes, and the input capacitors.

The leftovers from the older KM series PSUs can be spotted in the top and right part of the photo: the low-voltage section with small individual heatsinks, and the mains connector.

Thus, the overall circuit design is comparable to the other X series products: active PFC and dedicated voltage regulation based on DC-DC converters.

Like the above-discussed PSUs, the SS-1050XM (X-1050) uses an Infineon ICE2QR4765 chip for its standby source. A Rubycon capacitor can be seen nearby. The lower-wattage PSUs didn’t have components of that brand.

But as in the above-discussed models, the output capacitors are made by United Chemi-Con.

Cables and Connectors

The all-modular SS-1050XM (X-1050) is equipped with the following connectors:

  • Connector for a mainboard power cable
  • One connector for a CPU power cable
  • Four connectors for PCIe power cables (one of which can be used for a second CPU power cable)
  • Six peripheral power cables

Included with the PSU are:

  • One mainboard power cable with a 20+4-pin connector (60 cm)
  • One CPU power cable with a 4+4-pin connector (65 cm)
  • One CPU power cable with an 8-pin connector (65 cm)
  • Three graphics card cables with two 6+2-pin connectors on each (60 cm)
  • Two cables with three PATA power connectors (55+15+15 cm)
  • One cable with two PATA power connectors (35+15 cm)
  • Three cables with three SATA power connectors on each (55+15+15 cm)
  • One cable with two SATA power connectors (35+15 cm)
  • One Y-shaped adapter from a PATA power connector to two floppy-drive plugs (15 cm)

The cable system resembles the previous generation of X series PSUs with its dual graphics card cables and large number of PATA power connectors. As for SATA, the X-1050 only has one such connector more than the lower-wattage models discussed above.

There is one significant difference from the earlier X series products, though. Their modular cables were mostly flat (excepting the 20+4-pin mainboard cable and the dual graphics card cables) but the top-wattage models feature more conventional round cables in nylon sleeves.

The selection of cables and connectors is quite sufficient and, considering that such PSUs are targeted at very advanced PC configurations, the dual cables are okay, too. Such PCs are likely to include a top-end graphics card with two power connectors, so there won’t be unused cables hanging inside the computer case.


Like every other modern product from Seasonic, the X-1050 can deliver most of its power via the +12V rail whereas the load capacity of the other rails is relatively low (150 watts isn't much for a 1050W PSU).

It sports 80 PLUS Gold certification.

As opposed to the newest products from Seasonic, it comes with a 5-year warranty. That’s long, but the 7-year warranty of the KM3 series is even better.

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