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Two green 260-pin DDR4 SO-DIMM modules with black chips and gold contacts

Crucial

Crucial CT2K16G4S266M 32GB (16 x 2GB) DDR4 2666 SO-DIMM memory upgrade

SKU CH-9ECR-BV4PZ MPN CT2K16G4S266M

32 GB DDR4 2666 SO-DIMM kit with CL19 latency for the 27-inch 2019 iMac

  • Capacity32GB (16 x 2GB)
  • Type260-Pin DDR4 SO-DIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Compatible SystemApple
  • 32 GB total capacity for multitasking headroom
  • 16 GB modules in a 2-module kit
  • DDR4 2666 speed for responsive performance
  • CL19 latency for efficient data access
  • Validated for Apple iMac 27-inch 2019 model

Capacity and platform fit

This 32 GB kit is built as a pair of 16 GB DDR4 SO-DIMM modules for Apple systems. It targets owners of the iMac 19,1 Retina 5K 27-inch 2019 model who need the maximum supported memory. The modules run at 2666 MT/s with CL19 timing.

Compatibility checks

Verify that the iMac is the exact 2019 27-inch Retina 5K model identified as iMac 19,1 before ordering. Confirm the machine has four free 260-pin SO-DIMM slots or that you are replacing the existing pair. Ensure the operating system recognises the full 32 GB capacity after installation.

Sustained workload behaviour

The CL19 latency and 2666 MT/s data rate deliver steady throughput for long rendering, compilation or virtualisation sessions. Matched modules in dual-channel configuration keep bandwidth consistent across hours of use. The DDR4 design maintains stable operation without thermal throttling in the iMac enclosure.

Highlights

  • 32 GB total capacity for multitasking headroom
  • 16 GB modules in a 2-module kit
  • DDR4 2666 speed for responsive performance
  • CL19 latency for efficient data access
  • Validated for Apple iMac 27-inch 2019 model

Specifications

BrandCrucial
ModelCT2K16G4S266M
Capacity32GB (16 x 2GB)
Type260-Pin DDR4 SO-DIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Compatible SystemApple
Shipping weight0.01 kg
Package size91 × 80 × 5 mm

Questions about this item

What comes in the package and is anything else needed to install it?

The kit contains two 16 GB DDR4 2666 SO-DIMM modules for a total of 32 GB. No extra parts are required for installation in a compatible Apple iMac.

Which capacity version should I pick for the iMac 19,1?

This 32 GB kit (2 x 16 GB) is the listed configuration for the iMac (Retina 5K, 27-inch, 2019) iMac 19,1.

What does the 2666 MT/s rating mean once the memory is running in the iMac?

The modules operate at DDR4 2666 (PC4 21300) with CL19 latency, delivering the rated bandwidth and timing in the supported iMac.

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