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Green 260-pin DDR4 SO-DIMM circuit board with black memory chips and gold edge contacts

Crucial

Crucial CT32G4S266M 32GB DDR4 2666 SO-DIMM memory upgrade

SKU CH-FVJ3-9JGMK MPN CT32G4S266M

32 GB DDR4 2666 SO-DIMM module with CAS latency 19 and 1.2 V operation, compatible with Mac Mini 2018 and Retina 5K 2019 27-inch models

  • Total capacity32 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latency19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Product type260-Pin DDR4 SO-DIMM
  • 32GB capacity lets you run more apps at once
  • DDR4 2666 speed improves data transfer rates
  • CAS latency 19 reduces memory access delays
  • 2V operation lowers power consumption
  • Compatible with Mac Mini 2018 and iMac 27" 2019

Mac-compatible DDR4 SO-DIMM

This 32GB Crucial module uses 260-pin DDR4 SO-DIMM form factor and runs at DDR4 2666 (PC4 21300) with CAS latency 19 and 1.2V operation. It is unbuffered memory designed to increase Mac system performance, improve responsiveness and allow faster multitasking. The part is compatible with Mac Mini 2018 and Retina 5K 27-inch 2019 models.

Buyers upgrading compatible Mac systems

This module suits owners of the listed Mac Mini and iMac models who want a single 32GB stick to maximise capacity in a SO-DIMM slot. Builders working on Windows laptops, generic DDR4 SO-DIMM platforms, or any system not confirmed by the manufacturer should verify compatibility before purchase because this part is validated for specific Mac DDR4 systems.

32GB single-module capacity

The 32GB density decides whether one module fills a slot or leaves room for expansion. Systems with only one SO-DIMM slot reach full capacity immediately, while two-slot machines can add a second module later. Check your Mac model slot count before ordering.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $45.99
Cheaper than about 79% of the 21,161 comparable items (median $397.99).
Total capacity 32 GB
Typical for this category: the median of 20,941 items is 32 GB.
CAS latency 19
Lower than about 70% of the 483 comparable items (median 22).
Price per GB $1.44 per GB
Cheaper than about 95% of the 20,941 comparable items (median $8.19 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 nameCT32G4S266M
Total capacity32 GB
Product type260-Pin DDR4 SO-DIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latency19
Buffer typeUnbuffered
Power
Rated voltage1.2 V
Size & build
Shipping weight0.07 kg
Package size175 × 89 × 6 mm

Questions about this item

Does my Mac need a free 260-pin SO-DIMM slot to install this 32 GB DDR4 2666 module?

Yes, the CT32G4S266M is a single 260-pin DDR4 SO-DIMM that requires one empty laptop-style memory slot.

Will this DDR4 2666 stick run at its rated speed in a 2018 Mac Mini or 2019 27-inch 5K iMac?

Both listed Macs support DDR4 2666, so the module will operate at its specified 2666 MT/s CL19 1.2 V timings.

How can I verify the module is recognised at 32 GB and 2666 MT/s after installation?

Open About This Mac or System Report; memory should show 32 GB DDR4 at 2666 MHz with CAS latency 19.

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