Overview
The Seasonic FOCUS GX-550 is an 80 PLUS Gold certified 550W fully modular power supply offering premium build quality and low noise for mid-range builds, office systems, and HTPCs. Its compact 140mm depth, fully modular cabling, and 120mm FDB fan with semi-passive S3FC control keep it tidy and quiet. A single +12V rail, Active PFC + Full Bridge LLC + SR + DC to DC topology, and 100% Japanese 105°C capacitors deliver dependable power, all backed by a 10-year warranty.
Key Highlights
- 80 PLUS Gold and Cybenetics Gold (Lambda A) certified for 90%+ efficiency at 50% load, running cooler and using less power
- Fully modular cabling with 100% Japanese 105°C-rated capacitors for clean builds and long-term reliability
- 120mm FDB fan with S3FC semi-passive mode that stays off at low load for near-silent operation
- Single +12V rail design with Active PFC + Full Bridge LLC + SR + DC to DC topology provides stable, clean output
- Compact 140mm depth and a 10-year warranty make it a dependable premium value in the 550W tier
Technical Specifications
| Brand | Seasonic |
|---|---|
| Model | Seasonic FOCUS GX-550 |
| Wattage | 550W |
| Efficiency Rating | 80 PLUS Gold / Cybenetics Gold (Lambda A) |
| Form Factor | ATX |
| Modular | Fully Modular |
| ATX Standard | ATX 12V |
| Fan Size | 120mm |
| Fan Bearing | Fluid Dynamic Bearing (FDB) |
| Topology | Active PFC + Full Bridge LLC + SR + DC to DC |
| Capacitors | 100% Japanese electrolytic (105°C rated) |
| AC Input | 100-240V ~ 5A 50/60Hz |
| +12V Rail | Single +12V Rail (45.8A) |
| Protection | OPP / OVP / UVP / OCP / OTP / SCP |
| Connectors | 1x 24-pin ATX, 1x 4+4-pin CPU/EPS, 2x PCIe 6+2, 5x SATA, 3x Molex |
| Dimensions | 140 x 150 x 86 mm (W x L x H) |
| Weight | ~1.35 kg |
| MTBF | 100,000 Hours |
| Warranty | 10 Years |