Seasonic Goes Green: The Eco Power 300

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Seasonic Eco Power 300 Feature Highlights (from Seasonic web site)
Universal Video Card Support
Support new PCI-E video card technologies
Compatibility is nice, though power-guzzling PCIe graphics cards aren't exactly Green.
Smart & Silent Fan Control [ S²FC]
Smart thermal control to balance noise & cooling.
The same fan controller we've recommended for years.
Super High Efficiency [up to 85%]
Optimal solution for low energy consumption, noise & heat.
Low power consumption is certainly Green, though efficiency is less important than the consumption of the overall system.
Active Power Factor Correction [99% PF]
Reduces line loss & power distortion.
Reduced line losses benefit the utility company and mean less power has to be generated at the power station.
Double Ball Bearing Fan
Increases airflow & lifetime and reduces rotation speed and noise.
The safe choice for a high heat environment like a power supply.
Universal AC Input [Full Range]
Plug & run safely anywhere in the world.
A small environmental benefit in that less overstock is likely to be produced when there is a single international model.
5 Year Warranty
Our Commitments to superior quality.
Pretty good if you like warranties.


AC Input
100-240Vac; ~5A; 50/60 Hz
DC Output
Output Current
125W (28A) 270W
Combined Power
Operating temperature: 0 to 50°C. Relative Humidity: 20% to 80%.
(The rated power will reduce from 100% to 80% from 40°C to 50°C)


The Eco Power conforms to the SFX12V form factor, so it is about half the size of a standard ATX12V power supply. A steel adapter plate is included so that it can be installed in regular ATX systems. Its small size lends credibility to its Green claims — less volume means less overall materials went into its construction, which in turns means a smaller environmental footprint.

A close look at the label reveals that Seasonic's internal model number is SS-300SFD — the same model that we tested with an efficiency above 85%. The differences between that unit and the Eco Power 300 are minimal; it's most likely only the extras included in the retail package that set them apart.

Smaller physical footprint = smaller environmental footprint.

An ATX adapter plate allows the Eco Power to be installed in standard cases.

The casing is unpainted steel.

This restrictive grill is typical of SFX12V power supplies. What does that mean for airflow?



There are five cable sets and two adapters, all of which are quite short. Regular ATX-style cases should be alright, but don't expect to do much in the way of fancy cabling. The limited set of connectors is enough for a simple system, but it's not really intended for use in high end or gaming rigs.

  • 12" cable for main 20+4-pin ATX connector
  • 13" cable for 4-pin AUX12V connector
  • 1 x 25" cable with three 4-pin IDE drive connectors
  • 1 x 19" cable with two 4-pin IDE drive connectors
  • 1 x 16" cable with two SATA drive connectors
  • 1 x 4" adapter from two 4-pin IDE connectors to one PCIe graphics connector
  • 1 x 6" splitter from one 4-pin IDE connector to two floppy connectors

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