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Two green DDR4 DIMMs with black heat spreaders and gold contacts

Crucial

Crucial CT2K8G4DFRA266 16GB (2 x 8GB) DDR4 2666 desktop RAM

SKU CH-YM0M-JEW4T MPN CT2K8G4DFRA266

A 16 GB dual-channel DDR4 kit running at 2666 MT/s with CL19 latency and 1.2 V operation

  • Capacity16GB (2 x 8GB)
  • Type288-Pin PC RAM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • Buffered/RegisteredUnbuffered

Capacity 16GB (2 x 8GB)

Speed DDR4 2666 (PC4 21300)

CAS Latency CL19

  • Faster data transfer at 2666 MT/s for responsive multitasking
  • Up to 32% more bandwidth boosts throughput for demanding tasks
  • Up to 40% less power used at 1.2V voltage
  • Faster burst access improves sequential data throughput
  • Dual 8GB unbuffered DIMMs give 16GB total capacity

Dual-channel DDR4 kit

This 16 GB kit contains two 8 GB unbuffered DIMMs built for desktop systems that use 288-pin DDR4 slots. It targets builders who want a matched pair for dual-channel operation at standard voltage.

Standard 288-pin form factor

Each module runs at 1.2 V and carries a CL19 timing at 2666 MT/s. The familiar 288-pin layout fits any desktop board wired for DDR4 without needing low-profile clearance or special mounting hardware.

Matched pair for dual-channel bandwidth

The two sticks are factory paired so the memory controller can open both channels simultaneously, raising throughput by up to 32 % while cutting draw by up to 40 % versus a single module at the same speed.

Highlights

  • Faster data transfer at 2666 MT/s for responsive multitasking
  • Up to 32% more bandwidth boosts throughput for demanding tasks
  • Up to 40% less power used at 1.2V voltage
  • Faster burst access improves sequential data throughput
  • Dual 8GB unbuffered DIMMs give 16GB total capacity

Specifications

BrandCrucial
ModelCT2K8G4DFRA266
Capacity16GB (2 x 8GB)
Type288-Pin PC RAM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
Buffered/RegisteredUnbuffered
FeaturesSpeeds up to 2666 MT/s and faster data rates are expected to be available as DDR4 technology matures
Increase bandwidth by up to 32%
Reduce power consumption by up to 40%
Faster burst access speeds for improved sequential data throughout
Optimized for next generation processors and platforms
Shipping weight0.05 kg
Package size174 × 83 × 9 mm

Other versions of this model

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Questions about this item

What DDR4 speed does the CT2K8G4DFRA266 kit run at and what bandwidth ceiling does that impose?

The kit operates at 2666 MT/s, rated PC4 21300, which caps theoretical peak bandwidth at that data rate.

What physical slot and pin count must the motherboard provide for these modules?

Each 8 GB module is a 288-pin unbuffered DIMM, so the board needs standard desktop DDR4 slots.

How are the two sticks installed for dual-channel operation and what step is often missed?

Populate the two slots that share a channel — usually the same colour — and press each module down until the retention clips click on both ends.

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