GIGABYTE P550SS 80+ SIlver Non-Modular ATX 3.1 Power Supply ( 550W )

The GIGABYTE P550SS (model GP-P550SS) is a 550W non-modular ATX power supply built to the Intel ATX 12V v3.0 form factor standard, with compatibility declared for ATX 3.1. It holds an 80 PLUS Silver certification tested at 230V EU conditions, delivering 90% efficiency at typical load — meaning less heat generated inside your chassis and lower electricity draw during everyday computing tasks. Cooling is handled by a 120mm Fluid Dynamic Bearing (FDB) fan. FDB technology reduces friction compared with sleeve-bearing designs, which translates to quieter operation over the unit's rated life. GIGABYTE quotes a Mean Time Between Failures (MTBF) of greater than 100,000 hours, underlining the long-term reliability focus of this unit. Power delivery is arranged around a single +12V rail, which simplifies load distribution across CPU and GPU. Active Power Factor Correction (Active PFC) achieves a typical power factor above 0.9 at the rated input range of 155–240 Vac, 50–60 Hz. The P550SS ships with a full suite of hardware protections: Over Voltage Protection (OVP), Over Power Protection (OPP), Short Circuit Protection (SCP), Under Voltage Protection (UVP), Over Current Protection (OCP), and Over Temperature Protection (OTP). The power-good signal fires within 100–150 ms and hold-up time exceeds 16 ms, both within ATX specification tolerances. All cables use a flat, all-black design to assist cable management in compact builds. The unit physically measures 150 × 140 × 86 mm and carries a 3-year manufacturer warranty. Verified Specifications: • Model: GP-P550SS • Output Capacity: 550W • Form Factor: ATX 12V v3.0 (ATX 3.1 compatible) • 80 PLUS Rating: Silver (90% efficiency at typical load, 230V EU) • Fan: 120mm Fluid Dynamic Bearing (FDB) • Input Voltage: 155–240 Vac • Input Frequency: 50–60 Hz • Input Current: 6.3A • PFC: Active PFC (>0.9 typical) • MTBF: >100,000 hours • Protection: OVP, OPP, SCP, UVP, OCP, OTP • Power Good Signal: 100–150 ms • Hold Up Time: >16 ms • Dimensions: 150 × 140 × 86 mm • Cable Type: Flat, all black • Connectors: ATX/MB 20+4 Pin ×1 (600mm), CPU/EPS 4+4 Pin ×1 (650mm), PCIe 6+2 Pin ×2, SATA ×5, 4-Pin Peripheral ×3 • Warranty: 3 years