Corsair RM 2021 Black

650/750/850W

GoldATXATX 2.xFull modular2021

B+Published tier

Why this rating

Every criterion, its status, and the evidence behind it.

B+Published rating

B-Engine rating

Evidence

60%Limited lab data

PASS: 8
WARN: 2
FAIL: 0
N/D: 12

Ratings disagree by 2 steps

The engine rates this unit lower than the imported list, driven by the criteria listed below.

Architecture

PASS
Resonant primary stage (LLC)weight 3
PASS
Synchronous rectificationweight 2
PASS
Independent DC-DC converters for +5V and +3.3Vweight 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

PASS
Gold class efficiencyweight 2

Components

N/D
Capacitor temperature rating is not documentedweight 2
WARN
Rifle bearing fanweight 1.5
Hong Hua rifle bearing fan.(editorial note)

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 CWTweight 1.5
PASS
Platform Customweight 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
- — Fan bearing type: Rifle bearing fan
MET
Tier B - strong mainstreamspec 12.10

Weighted pass ratio 92% with 2 warning(s)
Capped at B-: confidence 60% does not support a higher rating

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
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: 650 W750 W850 W
Form factor: ATX
ATX generation: ATX 2.x
Efficiency class: Gold
AC input: Full range (~100–240 V)
Cable modularity: Full
Introduced: 2021

Electrical architecture

What is actually inside, when it is known.

Primary stage: LLC
Secondary rectification: SR
Minor rail regulation: DC-DC
Built by: CWT
Platform: Custom

Reviewer notes

Free text from the source, used by the engine as signals.

Triangular fan grille perforations. Hong Hua rifle bearing fan. Performance is assumed to be the same as 2019 version.

Rifle bearing fan reportedRifleconfidence 60%
Editorial note flags weak evidenceyesconfidence 60%
Documented measurement or teardown gapyesconfidence 60%

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 417). 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.