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Green ADATA DDR4 SO-DIMM circuit board with black memory chips

ADATA

ADATA 8GB DDR4 2666 CL19 SO-DIMM laptop RAM AD4S266638G19-B

SKU CH-8QSK-6N51T MPN AD4S266638G19-B

8 GB DDR4 2666 SO-DIMM with CL19 latency, 1.20 V operation and 260-pin form factor

  • Total capacity8 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Kit configurationDual Channel Kit
  • 8 GB capacity for smooth multitasking
  • DDR4-2666 speed for responsive performance
  • CL19 latency for efficient data access
  • 20 V operation reduces power draw
  • 260-pin SO-DIMM fits standard laptop slots

ADATA 8GB DDR4 2666 SO-DIMM

This ADATA module provides 8GB of DDR4 memory in a 260-pin SO-DIMM form factor. It operates at 2666 MHz with a CAS latency of CL19 and a voltage of 1.20V. The unbuffered, non-ECC design targets standard laptop upgrades for everyday computing tasks.

Suitable For Standard Laptop Upgrades

Users needing a single 8GB stick to replace a failed module or fill an empty slot will find this matches the PC4-21300 specification. Systems requiring ECC error correction or registered signal buffering cannot use this unbuffered non-ECC memory.

Key Spec DDR4 2666 CL19 1.20V

The DDR4 2666 speed with CL19 timing at 1.20V is the primary compatibility filter for this part. Verify your laptop supports this exact speed and voltage combination before purchase to ensure the module functions correctly.

How it compares

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

Price $40.99
Cheaper than about 64% of the 2,079 comparable items (median $70.99).
Total capacity 8 GB
Lower than about 60% of the 1,886 comparable items (median 16 GB).
Price per GB $5.12 per GB
Cheaper than about 63% of the 1,886 comparable items (median $5.94 per GB).

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Specifications

Product
Brand nameADATA
Model nameAD4S266638G19-B AD4S266638G19-S
Total capacity8 GB
Product type260-Pin DDR4 SO-DIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportNo
Buffer typeUnbuffered
Kit configurationDual Channel Kit
Power
Rated voltage1.2 V
Compatibility
Recommended forHigh Performance or Gaming Memory

Questions about this item

Will this 260-pin DDR4 SO-DIMM fit my laptop's memory slot?

The module uses the standard 260-pin DDR4 SO-DIMM form factor and runs at 1.20 V, matching the physical and electrical requirements of any laptop slot built for DDR4 SO-DIMMs.

What is the correct way to seat the module so it locks in place?

Align the notch with the key in the slot, insert at a slight angle, then press down firmly until both side clips click; the step most people miss is not pressing hard enough to engage both clips.

How do I know when this 8 GB CL19 stick should be replaced?

If the system develops random crashes, fails to boot or shows memory errors in a diagnostic tool, the module has likely failed and should be swapped out.

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