Seasonic G-550 Power Supply Review

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Introduction

Seasonic offers four models under their G series: 360 W, 450 W, 550 W, and 650 W, all featuring the 80 Plus Gold certification. We’ve already reviewed the 360 W model, which proved to be a winner. Let’s see if the 550 W version follows in the same footsteps.

Seasonic G-550Figure 1: Seasonic G-550 power supply

Seasonic G-550Figure 2: Seasonic G-550 power supply

The Seasonic G-550 is 6.3” (160 mm) deep, using a 120 mm ball-bearing fan on its bottom (ADDA AD1212MB-A70GL, the same used on the 360 W model).

Seasonic G-550Figure 3: Fan

Differently from the 360 W model, the Seasonic G-550 has a modular cabling system with six connectors: two for video card power cables and four for peripheral and SATA power cables. The unit comes with the main motherboard cable and an ATX12V/EPS12V cable permanently attached to it. They use nylon sleeves that come from inside the unit. This power supply comes with the following cables:

  • Main motherboard cable with a 20/24-pin connector, 21.2” (54 cm) long, permanently attached to the power supply
  • One cable with two ATX12V connectors that together form an EPS12V connector, 21.2” (54 cm) long, permanently attached to the power supply
  • Two cables, each with one six/eight-pin connector for video cards, 23.6” (60 cm) long, modular cabling system
  • One cable with four SATA power connectors, 16.9” (43 cm) to the first connector, 5.1” (13 cm) between connectors, modular cabling system
  • One cable with two SATA power connectors, 13” (33 cm) to the first connector, 5.1” (13 cm) between connectors, modular cabling system
  • One cable with three standard peripheral power connectors, 16.9” (43 cm) to the first connector, 5.1” (13 cm) between connectors, modular cabling system
  • One cable with two standard peripheral power connectors, 13” (33 cm) to the first connector, 5.1” (13 cm) between connectors, modular cabling system
  • One adapter to convert a standard peripheral power connector into a floppy disk drive power connector

All wires are 18 AWG, which is the correct gauge to be used.

The number of connectors is perfect for a 550 W power supply.

Seasonic G-550Figure 4: Cables

Let’s now take an in-depth look inside this power supply.

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Author: Gabriel Torres

Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.

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