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Two green DDR4 DIMMs with black chips and gold contacts

Crucial

Crucial CT2K8G4DFS8266 16GB (2x8GB) DDR4 2666 CL19 desktop RAM

SKU CH-YJWR-JG0HF MPN CT2K8G4DFS8266

A 16 GB DDR4 desktop kit with two 8 GB single-rank modules at 2666 MT/s, CL19 latency and 1.2 V operation

  • Capacity16GB (2 x 8GB)
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.20V
  • ECCNo
  • Buffered/RegisteredUnbuffered

Capacity 16GB (2 x 8GB)

  • 16 GB dual-channel kit adds multitasking headroom
  • 2666 MT/s DDR4 speed accelerates application loading
  • CL19 latency keeps response times tight
  • 2 V operation reduces system power draw
  • 100 % factory-tested modules deliver proven reliability

16 GB DDR4 Kit for Desktop Upgrades

This Crucial CT2K8G4DFS8266 kit provides 16 GB of DDR4 memory in a matched pair of 8 GB modules. It runs at 2666 MT/s with a CL19 latency and operates at the standard 1.2 V. The unbuffered, non-ECC DIMMs use a single-rank x8 organisation and fit 288-pin desktop slots.

Suits Standard Builds.

The kit is aimed at mainstream desktop owners who want a straightforward capacity increase for everyday multitasking and application loading. It works in consumer motherboards that accept unbuffered, non-ECC DDR4. Systems that require registered or ECC memory cannot use these modules, and users needing higher speeds or lower latencies should look elsewhere.

Factory-Tested Modules with Free Technical Support

Every module passes 100 % factory testing before it leaves the line, which helps ensure reliable operation in OEM and custom systems alike. Buyers also receive access to Crucial’s free technical support for installation questions or troubleshooting. No additional software, heat spreaders or lighting accessories are included in the package.

Highlights

  • 16 GB dual-channel kit adds multitasking headroom
  • 2666 MT/s DDR4 speed accelerates application loading
  • CL19 latency keeps response times tight
  • 2 V operation reduces system power draw
  • 100 % factory-tested modules deliver proven reliability

Specifications

BrandCrucial
ModelCT2K8G4DFS8266
Capacity16GB (2 x 8GB)
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.20V
ECCNo
Buffered/RegisteredUnbuffered
FeaturesCT2K8G4DFS8266 is a 16GB Kit consisting of (2) 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 weight0.08 kg
Package size175 × 116 × 13 mm

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Questions about this item

What motherboard slot does this 288-pin DDR4 DIMM kit require?

The kit uses standard 288-pin DDR4 DIMMs that fit any desktop motherboard with DDR4 memory slots.

How will the system run if I keep my existing DDR4 modules alongside this CL19 2666 MT/s kit?

All installed DDR4 modules will operate at the speed and timings of the slowest kit present, so the new modules will downclock to match your existing memory.

How can I verify the kit is running at 2666 MT/s with CL19 latency after installation?

Check the memory speed and timings in your BIOS or UEFI, or use a system-information tool such as CPU-Z to confirm 2666 MT/s and CL19 values.

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