Technical Snapshot

The Crucial Basics DDR4 4GB 2666MT/s DIMM CL19 — CB4GU2666 is a high-performance DDR4 desktop memory module . Running at 2,666 MT/s with CL19-19-19-42 timings at 1.2V, The module provides 4GB of DDR4 memory . Backed by a Limited Lifetime warranty, suited for gaming PCs, productivity workstations, and general desktop computing.

Use Case
Gaming, content creation, desktop computing
Compatibility
DDR4-compatible desktop motherboard
Category
DDR4 DIMM — Crucial Crucial Basics
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Crucial RAM
Crucial Crucial Basics

Basics DDR4 4GB 2666MT/s DIMM CL19 — CB4GU2666

DDR4 · DIMM · 2,666 MT/s · CL19-19-19-42 · 4GB

Memory transfer rate in megatransfers per second. Higher MT/s provides more bandwidth for CPU-bound workloads.
Speed 2,666 MT/s
Total kit capacity across all modules. Dual-channel kits double memory bandwidth.
Capacity 4GB
CAS latency and full timing chain. Lower CL means faster first-byte access time.
Timings CL19-19-19-42
Operating voltage. Higher voltage allows faster speeds but increases power and heat.
Voltage 1.2V
MPNCB4GU2666
EAN649528900463
CategoryMemory
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Memory Specifications

Memory TypeDDR4
Form FactorDIMM
Total Capacity4GB
Speed2,666 MT/s
TimingsCL19-19-19-42
Voltage1.2V
Module Height33.5 mm
WarrantyLimited Lifetime

Full Specifications

Data sourced from Crucial product specifications
Memory
Product LineCrucial Basics
Memory TypeDDR4
Form FactorDIMM
Total Capacity4GB
Module Count1
Module Capacity4GB
Speed2,666 MT/s
Timings & Voltage
TimingsCL19-19-19-42
Voltage1.2V
Design
Module Height33.5 mm
Product
BrandCrucial
MPNCB4GU2666
EAN649528900463
WarrantyLimited Lifetime
Physical
Weight0.050 kg (estimated)
Package Dimensions14.0 x 8.0 x 1.0 cm (estimated)

Support

Crucial Memory Compatibility ToolCheck motherboard compatibility for this module
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Crucial Basics DDR4 4GB 2666MT/s DIMM CL19 — CB4GU2666 DatasheetPDF · Technical specifications
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Frequently Asked Questions

What motherboards are compatible with this memory?

The Crucial Basics DDR4 4GB 2666MT/s DIMM CL19 — CB4GU2666 requires a DDR4-compatible motherboard. Compatible platforms include AMD AM4 (B550, X570, B450, etc.) and Intel LGA 1700 (B660, Z690) or LGA 1200 (B560, Z590). DDR4 is NOT compatible with DDR5 slots — they use different pin configurations.

What speed does this memory run at?

The Crucial Basics DDR4 4GB 2666MT/s DIMM CL19 — CB4GU2666 runs at 2,666 MT/s with CL19-19-19-42 timings. This is a JEDEC standard speed that works automatically without BIOS configuration.

Can I add more memory later?

Yes, the Crucial Basics DDR4 4GB 2666MT/s DIMM CL19 — CB4GU2666 is a single 4GB module. You can add additional compatible DDR4 DIMM modules to populate empty slots. For best performance, use matched modules of the same speed and capacity to enable dual-channel mode.

What is the form factor of this memory?

The Crucial Basics DDR4 4GB 2666MT/s DIMM CL19 — CB4GU2666 uses a DIMM form factor. Standard DIMM modules fit desktop motherboards.

What warranty does this memory come with?

The Crucial Basics DDR4 4GB 2666MT/s DIMM CL19 — CB4GU2666 comes with a Limited Lifetime warranty from Crucial.

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Product: Crucial Basics DDR4 4GB 2666MT/s DIMM CL19 — CB4GU2666
MPN: CB4GU2666
Schemas: Product + BreadcrumbList + FAQPage
Properties: 11 additionalProperty entries
Related: 4 isRelatedTo links