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Seasonic G Series 550W Power Supply review

Rating: 8.5.

Last week we reviewed the latest Seasonic G Series 360W Power supply and today we focus on the upper/mid range power output unit in the range, the G Series 550W Power Supply. Seasonic are offering the new G Series power supplies in 360W, 450W, 550W and 650W capacities targeting the cost conscious enthusiast audience who are in the market for a quality power supply without wanting to pay a fortune.

The Seasonic G Series 360W is undoubtedly an excellent supply, hitting a price sweet spot of £46.99 inc vat in the UK right now. I still believe Seasonic will have a problem selling a lot of them, due mainly to public perception of wattage ratings and what they feel would be needed to run a system today.

To stress the point of ‘overestimating power demand’ we can link you to a review we published a short while ago which focused around the Asus Maximus V Formula Z77 motherboard. On the power consumption page, the system demanded only 191 watts under 100% Cinebench R11.5 load. That system comprised a Core i7 3770k, overvolted and running at 4.8ghz, with 16GB of Corsair Dominator memory, running at 2,666mhz. There were also several drives in the mix, and a Corsair H100 liquid cooling the overclocked processor.

The G Series has been designed by Seasonic to target a much broader audience who aren't willing to spend a lot of money on a quality supply. That doesn't mean Seasonic are willing to compromise on quality however, because the 550W unit which we are reviewing today is 80 Plus Gold Certified with high grade Japanese components inside. Not only that, but the 550W unit is a modular design.

The asking price? A very modest £76.99 inc vat in the United Kingdom today.


  • 80 Plug Gold Certified
  • DC to DC Converter Design
  • Tight Voltage Regulations (±3%)
  • Smart and Silent Fan Control
  • High Reliable Aluminum Electrolytic Capacitors
  • Conductive Polymer Aluminum Solid Capacitors
  • Detachable Modular Cables
  • High Current Gold Plated Terminals
  • 12cm Ball Bearing Cooling Fan
  • Ultra Ventilation (honeycomb structure)
  • Mulit GPU Technology Support
  • Universal AC Input
  • 5 Year Warranty

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