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Two green rectangular SO-DIMM modules with black chips and gold contacts

Crucial

Crucial CT2K8G4SFS8266 16GB (2x8GB) DDR4 2666 CL19 laptop RAM

SKU CH-Q51B-FAJJG MPN CT2K8G4SFS8266

A 16 GB DDR4 laptop memory kit with two 8 GB modules running at 2666 MT/s and CL19 latency

  • Total capacity16 GB (2 × 8 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Memory timings19-19-19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered

Capacity 16GB (2 x 8GB)

  • 16 GB dual-channel kit for smoother multitasking
  • DDR4 2666 MT/s speed for responsive performance
  • CL19 latency with 19-19-19 timings
  • 20 V low-voltage operation reduces power draw
  • 260-pin SO-DIMM form factor fits standard laptop slots

What this kit adds

This 16 GB kit contains two 8 GB DDR4 SO-DIMM modules that run at 2666 MT/s with CL19 timings. It is built for laptops that accept 260-pin unbuffered non-ECC memory at 1.2 V.

Installation notes

The modules slot into standard 260-pin SO-DIMM sockets and require no configuration beyond seating them firmly until the side clips click. The most common issue is a single module not fully engaged, which leaves the system seeing only half the expected capacity.

DDR4 SO-DIMM limits

DDR4 SO-DIMM bandwidth tops out at the rated transfer rate, so workloads that scale with memory throughput will not exceed the 2666 MT/s ceiling. The 1.2 V operating voltage is fixed by the DDR4 standard and cannot be lowered for power saving or raised for overclocking on typical laptop platforms.

How it compares

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

Price $46.99
Cheaper than about 60% of the 2,079 comparable items (median $70.99).
Total capacity 16 GB (2 × 8 GB)
Typical for this category: the median of 1,886 items is 16 GB.
Price per GB $2.94 per GB
Cheaper than about 91% 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 nameCrucial
Model nameCT2K8G4SFS8266
Total capacity16 GB (2 × 8 GB)
Product type260-Pin DDR4 SO-DIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
Memory timings19-19-19
ECC supportNo
Buffer typeUnbuffered
Power
Rated voltage1.2 V
Size & build
Shipping weight0.07 kg
Package size174 × 117 × 11 mm

Other versions of this model

5 more in the same range

Questions about this item

How can I confirm the kit is running at 2666 MT/s with CL19 latency after installation?

Open Task Manager or a tool such as CPU-Z; the memory tab should show 2666 MHz speed and 19-19-19 timings for each 8 GB module.

What comes in the CT2K8G4SFS8266 box and is anything else required?

The box contains two 8 GB 260-pin DDR4 SO-DIMM sticks; no extra cables, brackets or software are needed for a standard laptop slot.

Should I choose the 16 GB (2×8 GB) kit or a different capacity for my upgrade?

This 16 GB kit provides two matched 8 GB modules for dual-channel operation; select it when your laptop has two free SO-DIMM slots and supports DDR4 2666.

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