Seasonic S12III
500/550/650W
Why this rating
Every criterion, its status, and the evidence behind it.
Evidence
- PASS
- 5
- WARN
- 3
- FAIL
- 1
- N/D
- 13
Ratings disagree by 5 steps
The engine rates this unit higher than the imported list, usually because the list de-tiers units that lack independent testing while the engine records that as low confidence instead.
Architecture
- PASS
Resonant primary stage (LLC)weight 3
- FAIL
Passive (Schottky) rectificationweight 2
- WARN
Independent-ish regulation (DMA)weight 3
- N/D
PFC type is not documented; APFC assumed only when statedweight 2
Standards
- WARN
ATX 2.x generation platformweight 2
- PASS
Full-range input (~100-240 VAC)weight 2
Efficiency
- WARN
Bronze class efficiencyweight 2
Components
- N/D
Capacitor temperature rating is not documentedweight 2
- N/D
Fan bearing type is not documentedweight 1.5
Protections
- N/D
Protection set has not been verified independentlyweight 3
- N/D
OCP declaration has not been verifiedweight 2
- N/D
OTP declaration has not been verifiedweight 1.5
- N/D
Protection trip points have not been measuredweight 2
Electrical performance
- N/D
No qualitative electrical assessment on recordweight 3
- N/D
No ripple measurement on recordweight 3
- N/D
No voltage regulation measurement on recordweight 2
- N/D
No transient response measurement on recordweight 2
Evidence
- PASS
Built by RSYweight 1.5
- PASS
Platform S12IIIweight 1.5
- N/D
No independent laboratory report linked yetweight 2
Warranty and support
- N/D
Warranty length is not documentedweight 1.5
Safety
- PASS
No safety incidents or false claims on recordweight 3
How the tier was reached
- MISSED
Tier A - reference classspec 12.9
- — Secondary rectification: Passive (Schottky) rectification
- — Minor rail regulation: Independent-ish regulation (DMA)
- — Efficiency certification: Bronze class efficiency
- — Too many warnings for this tier (2)
- — Too many failed criteria for this tier (1)
- MISSED
Tier B - strong mainstreamspec 12.10
- — Secondary rectification: Passive (Schottky) rectification
- — Too many failed criteria for this tier (1)
- MET
Tier C - adequatespec 12.11
- Weighted pass ratio 73%, 3 warning(s), confidence 74%
Missing evidence
These criteria could not be resolved. They lower the confidence index rather than count against the unit.
- Active power factor correction
- Electrolytic capacitor temperature rating
- Fan bearing type
- Protection coverage
- Over-current protection declared
- Over-temperature protection declared
- Protection trip points
- Measured electrical behaviour
- +12V ripple
- Voltage regulation
- +12V transient response
- Independent laboratory evidence
- Manufacturer warranty
Specification
Values carry the source they came from; unknowns stay unknown.
- Capacities
- 500 W550 W650 W
- Form factor
- ATX
- ATX generation
- ATX 2.x
- Efficiency class
- Bronze
- AC input
- Full range (~100–240 V)
- Cable modularity
- No
- Introduced
- 2019
Reviewer notes
Free text from the source, used by the engine as signals.
Claims only SCP, OPP, and over/under voltage. OCP not claimed on any rail.
Where this data comes from
Each field records which source supplied it and how sure we are.
| Field | Source | Confidence | Captured |
|---|---|---|---|
| oem | PSU Tier List (seed workbook)trust 70 | 70% | workbook import |
| intro_year | PSU Tier List (seed workbook)trust 70 | 70% | workbook import |
| modularity | PSU Tier List (seed workbook)trust 70 | 70% | workbook import |
| atx_version | PSU Tier List (seed workbook)trust 70 | 70% | workbook import |
| form_factor | PSU Tier List (seed workbook)trust 70 | 70% | workbook import |
| input_range | PSU Tier List (seed workbook)trust 70 | 70% | workbook import |
| platform | PSU Tier List (seed workbook)trust 70 | 70% | workbook import |
| editorial_tier | PSU Tier List (seed workbook)trust 70 | 70% | workbook import |
| efficiency_class | PSU Tier List (seed workbook)trust 70 | 70% | workbook import |
| primary_topology | PSU Tier List (seed workbook)trust 70 | 70% | workbook import |
| minor_rail_regulation | PSU Tier List (seed workbook)trust 70 | 70% | workbook import |
| secondary_rectification | PSU Tier List (seed workbook)trust 70 | 70% | workbook import |
Primary source: PSU Tier List (seed workbook) (row 866). Community-maintained tier list imported as the seed data set. Ratings from this source are shown as the published tier; the Tier Engine computes its own rating separately.