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Four green DDR4 DIMMs with black heat spreaders and gold contacts

Crucial

Crucial CT4K8G4DFS8266 32GB (4 x 8GB) DDR4 2666 CL19 desktop RAM

SKU CH-W9M8-7F56D MPN CT4K8G4DFS8266

A 32 GB kit of four 8 GB DDR4 2666 MT/s CL19 unbuffered desktop DIMMs at 1.20 V

  • Capacity32GB (4 x 8GB)
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.20V
  • ECCNo
  • Buffered/RegisteredUnbuffered

Capacity 32GB (4 x 8GB)

  • 32 GB total capacity from four 8 GB modules
  • 2666 MT/s DDR4 speed for responsive multitasking
  • CL19 latency keeps data access quick
  • 20 V operation reduces power draw
  • 100 % factory tested for reliable operation

32GB DDR4 2666 kit for desktop builds

This 32GB kit contains four 8GB unbuffered DDR4 modules rated at 2666 MT/s with CL19 latency. It operates at the standard 1.20V and uses a 288-pin DIMM layout. The kit is suited for mainstream desktop systems that require a straightforward capacity upgrade without ECC or registered buffering.

Sustained-load behaviour with single-rank modules

Each module is single-ranked and x8 based, which helps maintain consistent throughput during extended workloads. The 1.20V operating voltage keeps thermal output modest under continuous use. Factory testing at 100% coverage aims to reduce early-life failures that can appear after prolonged operation.

DDR4 2666 interface practical limits

The DDR4 2666 (PC4 21300) standard caps the maximum data rate at 2666 MT/s, so this kit cannot exceed that speed even if the platform supports higher frequencies. CL19 latency is fixed for this specification tier. Systems limited to lower DDR4 speeds will downclock the modules automatically, while platforms requiring ECC or registered DIMMs cannot use this unbuffered non-ECC kit.

Highlights

  • 32 GB total capacity from four 8 GB modules
  • 2666 MT/s DDR4 speed for responsive multitasking
  • CL19 latency keeps data access quick
  • 20 V operation reduces power draw
  • 100 % factory tested for reliable operation

Specifications

BrandCrucial
ModelCT4K8G4DFS8266
Capacity32GB (4 x 8GB)
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.20V
ECCNo
Buffered/RegisteredUnbuffered
FeaturesCT4K8G4DFS8266 is a 32GB Kit consisting of (4) 8GB Single Ranked 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.
Shipping weight0.12 kg
Package size173 × 124 × 37 mm

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Questions about this item

How much heat and power do the four 8 GB DDR4 2666 CL19 modules draw when running continuously?

The kit runs at 1.20 V and is unbuffered, so each 8 GB module draws only modest power and generates little heat under sustained load.

What motherboard feature must I already have to install this 32 GB DDR4 2666 kit?

You need four free 288-pin DDR4 DIMM slots that support 2666 MT/s unbuffered non-ECC memory.

Will these CL19 2666 MT/s modules work alongside older DDR4 sticks I keep in the other slots?

They will run at the speed and latency of the slowest installed modules, so older DDR4 memory forces the whole system to its lower rated timing.

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