Seasonic S12III 550 SSR-550GB3 (2019) Power Supply

Seasonic S12III 550 SSR-550GB3 (2019)

Brand
Seasonic
Model
S12III 550 SSR-550GB3

Seasonic S12III 550 (SSR-550GB3): 2019 550W 80+ Bronze, non‑modular ATX PSU for budget builds with S2FC fan control and 5‑year warranty; now discontinued.

TierBudget?GixCore tierWhat a part was built to do — not what it costs.EntryBudgetMainstreamHigh endEnthusiastFlagship A part can be cheap because it is an ageing flagship, or because it is a current entry-level model. The tier tells you which.
Released2019
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Wattage550 W
Efficiency80+ Bronze
Form factorATX
ModularNo
GixCore Editorial

Product overview

Introduced in 2019, the S12III 550 (SSR-550GB3) is the 550 W model in Seasonic’s third‑generation S12III Bronze series for standard ATX 12 V builds. The series page lists fixed cabling, 80 PLUS Bronze efficiency and a 5‑year warranty.Sourceinvestor.seasonic.com

Positioned as a budget PSU (non‑modular Bronze), it exists to cover affordable, no‑frills desktop builds. At 550 W it suits everyday PCs and mid‑range gaming systems that don’t require ATX 3.0/12VHPWR features; Seasonic’s S2FC controls a 120 mm fan for simple acoustics. The S12III line is now listed under Discontinued Products on Seasonic’s site.Sourceseasonic.com

LifecycleDiscontinued
Best for
  • budget builds
  • mid-range gaming
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Specifications

At a glance iEach dot represents a catalog model. Farther right means a higher measured value, not necessarily a better fit.Measured against the power supplies catalog
Current modelCatalog models
Wattage550 W
Higher than 8% of power supplies
Wattage
550 W
Efficiency
80+ Bronze
Modular
No
Eco Mode
No
Form factor
ATX