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Four green circuit boards with black memory chips and gold connectors lying side by side

Crucial

Crucial CT4K16G4DFD8266 64GB (4×16GB) DDR4 2666 CL19 desktop RAM

SKU CH-3EBQ-Y9XYV MPN CT4K16G4DFD8266

A 64 GB quad-channel kit of four 16 GB DDR4 2666 CL19 unbuffered DIMMs running at 1.2 V for desktop upgrades

  • Capacity64GB (4 x 16GB)
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.20V
  • ECCNo
  • Buffered/RegisteredUnbuffered

Capacity 64GB (4 x 16GB)

  • 64GB total capacity from four 16GB modules for high-performance multitasking
  • DDR4 2666 MT/s speed delivers responsive desktop performance
  • CL19 latency and 1.2V operation balance speed with efficiency
  • Quad-channel kit design maximises memory bandwidth on supported platforms
  • Unbuffered non-ECC DIMMs tested for broad OEM system compatibility

64 GB quad-channel DDR4 kit

This Crucial kit delivers 64 GB of desktop memory across four 16 GB modules. It is built for systems that accept DDR4 2666 MT/s unbuffered DIMMs. The pack targets high-performance or gaming workloads that benefit from a large capacity in a matched set.

DDR4 2666 MT/s interface limit

The modules run at the standard DDR4 2666 MT/s data rate with CL19 latency at 1.2 V. Speed and timing are fixed by the JEDEC specification for this frequency; the kit will not exceed 2666 MT/s without manual overclocking. Motherboards that only support lower DDR4 speeds will downclock the memory automatically.

Unbuffered non-ECC requirement

This is an unbuffered, non-ECC UDIMM kit using a 288-pin layout. It will not work in platforms that require registered or ECC memory, such as many server or workstation boards. Buyers needing registered DIMMs or error-correcting code support must choose a different product.

Highlights

  • 64GB total capacity from four 16GB modules for high-performance multitasking
  • DDR4 2666 MT/s speed delivers responsive desktop performance
  • CL19 latency and 1.2V operation balance speed with efficiency
  • Quad-channel kit design maximises memory bandwidth on supported platforms
  • Unbuffered non-ECC DIMMs tested for broad OEM system compatibility

Specifications

BrandCrucial
ModelCT4K16G4DFD8266
Capacity64GB (4 x 16GB)
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.20V
ECCNo
Buffered/RegisteredUnbuffered
Multi-channel KitQuad Channel Kit
ChipsetMajor Brand Chipset
FeaturesCT4K16G4DFD8266 is a 64GB Kit consisting of (4) 16GB DDR4 desktop modules that operates at speeds up to 2666 MT/s and has a CL19 latency. It is an Unbuffered DIMM. It conforms to the industry standard DDR4 ECC UDIMM layout of 288 pins and is compatible with systems that take DDR4 2666 MT/s UDIMM memory.
Recommend UseHigh Performance or Gaming Memory
Shipping weight0.13 kg
Package size174 × 126 × 22 mm

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Questions about this item

Will this 64 GB kit work in a motherboard that only supports dual-channel memory?

Yes, the four modules will run in dual-channel mode on a dual-channel board; you simply populate all four slots and the memory controller manages the channels.

Does the CL19 latency at 2666 MT/s require any manual BIOS tuning?

No, the kit is rated for 2666 MT/s CL19 at 1.20 V and will apply those timings automatically via standard JEDEC SPD data.

Are these modules compatible with laptops or small-form-factor PCs that use SO-DIMM slots?

No, they are 288-pin UDIMMs designed for full-size desktop motherboards and will not fit SO-DIMM sockets.

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