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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

  • Total capacity4 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Recommended forAMD & Intel Compatible
  • 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.

How it compares

Measured against everything we stock in Laptop RAM, at today’s prices. Recalculated every night.

Price $30.99
Cheaper than about 73% of the 2,079 comparable items (median $70.99).
Total capacity 4 GB
Lower than about 80% of the 1,886 comparable items (median 16 GB).
Price per GB $7.75 per GB
Pricier than about 68% of the 1,886 comparable items (median $5.94 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameA-Tech
Total capacity4 GB
Product type260-Pin DDR4 SO-DIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportNo
Buffer typeUnbuffered
Power
Rated voltage1.2 V
Compatibility
Recommended forAMD & 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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