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Amazon US · ASIN B08C4QF5N4

Crucial RAM 8GB DDR4 2666 MHz CL19 Desktop Memory CT8G4DFRA266

The single 8 GB DDR4 UDIMM combines 2666 MT/s, CL19 and 1.2 V specifications with a limited-lifetime warranty statement. That makes matching the motherboard more useful than treating a speed label as a performance promise. TechReviewer's poor gaming judgment is based on specification analysis; the separate PassMark result belongs to C8FP systems and cannot predict this buyer's frame rates or establish universal revision compatibility.

Updated 2026-10-08

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Prices and sellers

No price information yet

Conditions and limitations

Rated DDR4 desktop operating conditions

Manufacturer stated · Published source

Capability
One unbuffered DDR4 UDIMM with a manufacturer rating of 2666 MT/s, CL19, 19-19-19 and 1.2 V.
Limitations
  • A rated speed does not establish exact-system compatibility or measured application performance.
Requirements
  • Verify the motherboard model and supported memory speeds before selection.

country: US · variant: CT8G4DFRA266 8 GB single module

Crucial · TechReviewer · Prefeitura Municipal de Cabo Verde

Datasheet establishes 2666 MT/s, CL19, 19-19-19 and 1.2 V; actual motherboard/CPU qualification and delivered revision remain unknown.

Compatibility

DDR4 UDIMM, 288-pin and non-ECC requirements are corroborated. No controlled exact-model board compatibility case or QVL approval was established.

DDR4 UDIMM, 288-pin and non-ECC requirements are corroborated. No controlled exact-model board compatibility case or QVL approval was established.

Where sources differ

Manufacturer lists three extended timings. TechReviewer's calculated 14 ns CAS interpretation and PassMark's C8FP 39 ns system-test average describe different metrics; no controlled comparison closes revision differences.

Manufacturer lists three extended timings. TechReviewer's calculated 14 ns CAS interpretation and PassMark's C8FP 39 ns system-test average describe different metrics; no controlled comparison closes revision differences.

Reported issues and fixes

No confirmed exact-model failure pattern established. Russian hands-on source returned source_fetch_denied, several public support sources were robots denied, and editorial specification judgment is not failure evidence.

No confirmed exact-model failure pattern established. Russian hands-on source returned source_fetch_denied, several public support sources were robots denied, and editorial specification judgment is not failure evidence.

Care and support

Manufacturer warranty statement

Manufacturer stated

Details
The exact-model datasheet states a limited-lifetime warranty. It does not specify detailed eligibility or local replacement procedures.

country: US · variant: CT8G4DFRA266

Crucial

Exact-model datasheet says limited lifetime; detailed eligibility, region-specific policies and future availability were not established.

Who it suits

Choose by verified desktop requirements

Manufacturer stated · Published source · Independent test

Check before buying
  • Check motherboard support, existing memory configuration and delivered revision.
  • Do not interpret the C8FP benchmark as a guarantee for another revision.
Constraints
  • System must accept the documented format and operating specifications.
Needs
  • One 8 GB DDR4 unbuffered desktop module.
Reason
Consider it when the documented capacity and module requirements meet a verified desktop need. A performance-focused purchase still lacks controlled exact-model English testing.
Tradeoffs
  • Specification-based criticism and C8FP benchmark averages do not establish the buyer's workload result.
Assessment
conditional

country: US · variant: CT8G4DFRA266 8 GB single module

Crucial · TechReviewer · PassMark Software · JACOB · Prefeitura Municipal de Cabo Verde · Le Sueur County / ITsavvy

Documented module specifications support a conditional capacity-upgrade decision. Workload gains, exact-platform approval and delivered C8FP identity remain unresolved.

Areas not yet researched (1)

No conclusion is available for these areas. This does not mean the Product has no limitations or reported issues.

  • Ownership costs

Measured performance

Memory latency

39 ns

PassMark PerformanceTest V10 submitted-result average for CT8G4DFRA266.C8FP · C8FP revision only. Mixed submitted systems; CPU, motherboard, channel configuration, firmware and operating settings are not controlled here. The assigned ASIN does not establish that every delivered module is C8FP. This is not the calculated CAS first-word latency.

Source [6]

Buyer questions

Before you buy

How much memory does one module provide?

The datasheet lists one 8 GB module. [2]

Compatibility

What type of memory is CT8G4DFRA266?

It is DDR4 unbuffered UDIMM desktop memory. The US specification corroborates a 288-pin DIMM format and non-ECC status; match these requirements to the system rather than relying on capacity alone. [2], [4]

Setup

What should I check before buying?

Check the motherboard model and supported memory speeds, DDR4 unbuffered DIMM requirements, 288-pin form factor and the 1.2 V specification. A matching speed label does not by itself establish compatibility with a particular CPU, board or mixed-memory configuration. [2], [1], [4]

Everyday use

What is the rated memory speed?

The module is specified at 2666 MT/s. [2]

Limitations

Does the poor gaming rating prove poor frame rates?

No. TechReviewer rates the speed, latency and capacity combination poorly, but its 14 ns figure is calculated from timings and clock rate. The retrieved article does not establish exact-model frame rates. PassMark separately reports 39 ns average system-test latency for C8FP submissions, which is a different measurement and scope. [1], [6]

Facts and specifications

Manufacturer datasheet

SpecificationValueSource
CAS Latency19 US[2]
Form FactorUDIMM, unbuffered US[2], [3]
Memory Capacity7.45058059692 GB US[2]
Memory Speed2666 MT/s US[2]
Memory TypeDDR4 US[2]
Module Count1 US[2]
Timings19-19-19 US[2]
Voltage1.2 V US[2]
WarrantyLimited Lifetime US[2]

Retailer listing

SpecificationValueSource
ECC SupportNo US[4], [5]
Form Factor288-pin DIMM US[4]

Other facts

SpecificationValueSource
Buyer FitBest considered for basic desktop upgrades rather than demanding gaming or professional workloads. US[1]
LimitationThe reviewer calculated first-word latency at 14 ns and rated it poor. US; The reviewer rated the combination of speed, latency and capacity poorly for gaming and professional tools. US[1]
Setup RequirementCheck the motherboard model and supported memory speeds before installation. US[1]

Data: JSON · CSV

KnowSpec analysis

A compatibility-led desktop upgrade

The single 8 GB DDR4 UDIMM combines 2666 MT/s, CL19 and 1.2 V specifications with a limited-lifetime warranty statement. That makes matching the motherboard more useful than treating a speed label as a performance promise. TechReviewer's poor gaming judgment is based on specification analysis; the separate PassMark result belongs to C8FP systems and cannot predict this buyer's frame rates or establish universal revision compatibility.

Method: Manufacturer specification synthesis with attributed editorial judgment and revision-scoped benchmark context.

Visible information gaps

Missing information is shown rather than guessed.

  • Topic:Rank Density And Chip Layoutnot public
  • Topic:Thermal Clearancenot found
  • Topic:Motherboard Qvlnot public
  • Topic:Platform And Cpu Supportnot found
  • Topic:Stability And Overclockingnot found
  • Topic:Upgrade Mixing And Populationnot public
  • Topic:Platform Supportnot found

Sources and method

  1. Crucial Desktop Memory CT8G4DFRA266 OverviewTechReviewer · retrieved 2026-09-28Editorial review
  2. Crucial 8GB DDR4-2666 UDIMM CT8G4DFRA266Crucial · retrieved 2026-09-28DatasheetPDF
  3. Procurement technical study item 47Prefeitura Municipal de Cabo Verde · retrieved 2026-10-08Other sourcePDF
  4. Board packet exact-model module specificationLe Sueur County / ITsavvy · retrieved 2026-10-08Other sourcePDF
  5. Crucial CT8G4DFRA266 specificationsJACOB · retrieved 2026-10-08Retailer listing
  6. Crucial Technology CT8G4DFRA266.C8FP 8GB benchmark averagesPassMark Software · retrieved 2026-10-08Lab review
  7. Public Procurement Technical SpecificationSESI/SENAI Paraiba · retrieved 2026-09-28Standards bodyPDF
Updated: 2026-10-08 · Research accepted 2026-10-08Method: document and public-data analysis by an authorised research Agent with deterministic KnowSpec validation. No physical testing unless a section says otherwise. Missing or conflicting evidence stays visible instead of being guessed.