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Green circuit board with black memory chips and gold edge connector

A-Tech

A-Tech 4GB DDR4 2666MHz CL19 260-Pin SODIMM 1Rx8 Crucial CT4G4SFS8266 Laptop RAM

SKU CH-0RZS-S39GH

4GB DDR4 2666MHz CL19 260-pin SODIMM laptop memory module for compatible notebooks

  • Capacity4GB
  • Type260-Pin DDR4 SO-DIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.20V
  • ECCNo
  • 4GB DDR4 2666MHz module speeds up laptop loading times
  • CL19 latency at 1.20V standard voltage for efficient operation
  • 260-pin SO-DIMM form factor fits compatible laptop memory slots
  • 1Rx8 unbuffered non-ECC design works with AMD and Intel systems
  • Replacement equivalent for Crucial CT4G4SFS8266 part number 8266

Capacity and fit

This 4 GB DDR4 SO-DIMM uses the 260-pin layout required by most modern laptops and all-in-one systems. It is an unbuffered, non-ECC module built with major-brand chips and rated for 1.20 V operation.

Sustained workload behaviour

The module runs at 2666 MHz with a CAS latency of CL19, delivering PC4-21300 bandwidth for everyday multitasking and heavier background tasks. Quality-assurance testing on each stick aims to keep performance stable during extended sessions rather than only in short bursts.

Thermals, noise and power

Standard DDR4 voltage of 1.20 V keeps power draw low and heat output minimal inside a closed chassis. With no active cooling on the module itself, operation stays silent while the laptop’s own thermal solution manages the small additional load.

Highlights

  • 4GB DDR4 2666MHz module speeds up laptop loading times
  • CL19 latency at 1.20V standard voltage for efficient operation
  • 260-pin SO-DIMM form factor fits compatible laptop memory slots
  • 1Rx8 unbuffered non-ECC design works with AMD and Intel systems
  • Replacement equivalent for Crucial CT4G4SFS8266 part number 8266

Specifications

BrandA-Tech
Capacity4GB
Type260-Pin DDR4 SO-DIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.20V
ECCNo
Buffered/RegisteredUnbuffered
FeaturesMajor Brand Chips
Recommend UseAMD & Intel Compatible

Questions about this item

How much power does the 1.20 V DDR4 2666 module draw when the laptop runs all day?

It operates at the standard 1.20 V DDR4 voltage, so power draw stays low and heat output remains minimal during extended use.

What must my laptop already have for this 260-pin SODIMM to work?

A free DDR4 SO-DIMM slot that accepts 260-pin modules and supports 2666 MHz (PC4-21300) memory.

Will this CL19 2666 MHz stick run stably alongside other DDR4 modules I keep installed?

Yes — it is a standard non-ECC unbuffered DDR4 2666 MHz module, so it will run at the lowest common speed and timing with other DDR4 sticks.

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