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Green printed circuit board with black memory chips, 260-pin SO-DIMM form factor, no heat spreader

Crucial

Crucial CT4G4SFS8266 4GB DDR4 2666 CL19 SODIMM laptop RAM

SKU CH-4TPE-V7RCT MPN CT4G4SFS8266

4GB DDR4 2666 CL19 SODIMM laptop memory running at 1.2V for up to 30% more bandwidth and 40% lower power consumption

  • Capacity4GB
  • Type260-Pin DDR4 SO-DIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.20V
  • ECCNo

Capacity 4GB

  • 64GB (2 x 32GB)
  • 32GB
  • 32GB (2 x 16GB)
  • 16GB
  • 16GB (2 x 8GB)
  • 8GB
  • 8GB (2 x 4GB)
  • 4GB

Struck-through versions exist but are not stocked here.

  • Boosts system responsiveness with 2666 MT/s DDR4 speed
  • Cuts power draw by up to 40% for longer battery life
  • Delivers up to 30% more bandwidth for smoother multitasking
  • Fits standard 260-pin laptop slots with unbuffered DDR4 design
  • Runs cool at 1.2 V without a heat spreader needed

Crucial 4GB DDR4 2666 SODIMM

This Crucial CT4G4SFS8266 module adds 4GB of DDR4 memory to a compatible laptop. It runs at 2666 MT/s with a CL19 latency and operates at 1.20V. The unbuffered, non-ECC design uses a standard 260-pin SO-DIMM form factor.

Suits laptops with a free DDR4 SO-DIMM slot

The module fits systems that accept DDR4 260-pin memory and can run at 2666 MT/s or lower. It is not for machines that only support older DDR generations, proprietary memory soldered to the board, or desktops requiring full-size DIMMs.

Speed rated at 2666 MT/s (PC4-21300)

The JEDEC-standard 2666 MT/s rating determines whether this module matches the motherboard's supported memory speed. If the platform requires a different DDR4 speed grade, the module will typically downclock, but the rated speed is the key compatibility figure.

Highlights

  • Boosts system responsiveness with 2666 MT/s DDR4 speed
  • Cuts power draw by up to 40% for longer battery life
  • Delivers up to 30% more bandwidth for smoother multitasking
  • Fits standard 260-pin laptop slots with unbuffered DDR4 design
  • Runs cool at 1.2 V without a heat spreader needed

Specifications

BrandCrucial
ModelCT4G4SFS8266
Capacity4GB
Type260-Pin DDR4 SO-DIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.20V
ECCNo
Buffered/RegisteredUnbuffered
Heat SpreaderNo
FeaturesSpeeds up to 3200 MT/s and faster data rates are expected to be available as DDR4 technology matures
Increase bandwidth by up to 30%
Reduce Power consumption by up to 40% and extend battery life
Faster burst access speeds for improved sequential data throughput
Optimized for next Generation Processors and Platforms
Shipping weight0.02 kg
Package size108 × 51 × 3 mm

Other versions of this model

1 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

Should I pick this single 4 GB stick or look for an 8 GB kit instead?

This module is a single 4 GB DDR4 2666 CL19 SODIMM; choose it when your laptop has a free slot and you only need 4 GB more, otherwise consider a matched 8 GB kit for dual-channel performance.

What does the 2666 MT/s rating actually deliver inside my laptop?

The 2666 MT/s rating means the module transfers data at up to 2666 million transfers per second at CL19 latency and 1.20 V, giving the bandwidth the platform requests at that speed.

Will the 260-pin DDR4 SO-DIMM interface limit the speed in my system?

The 260-pin DDR4 SO-DIMM interface supports the rated 2666 MT/s; the module will run at the highest speed the laptop's memory controller allows, up to that limit.

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