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Green circuit board with black memory chips, narrow 260-pin SODIMM form factor

NEMIX RAM

NEMIX RAM 32GB DDR4 2666 CL19 2Rx8 260-pin SODIMM Apple iMac 27" 5K Mid 2020 memory upgrade

SKU CH-QKVK-M6NT1

32 GB DDR4-2666 SODIMM module built for 27-inch 5K iMacs released in 2020

  • Total capacity32 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • 32 GB capacity handles heavy multitasking and large projects
  • DDR4 2666 MHz speed matches the iMac 27" 5K Mid 2020 memory bus
  • CL19 CAS latency keeps timing tight for stable operation
  • 2Rx8 dual-rank organisation maximises density in a single SODIMM slot
  • 2 V low voltage reduces power draw and heat in the all-in-one chassis

32GB DDR4 2666 SODIMM for 27" iMac 5K Mid 2020

This 32GB DDR4 2666 CL19 SODIMM module is built specifically for the Apple 27-inch iMac with Retina 5K Display Mid 2020 models iMac 20,1 and iMac 20,2. It delivers 32GB of non-ECC unbuffered memory in a single 260-pin stick running at 1.2V. The 2Rx8 organisation matches the original specification for these all-in-one desktops.

Sustained workload stability validated by stress

Each module undergoes rigorous stress testing under load to ensure reliability during extended work sessions. The CL19 latency and 2666 MT/s data rate provide consistent throughput for memory-intensive tasks such as large creative projects, virtual machines or heavy multitasking. Unbuffered operation keeps latency low without the overhead of registered designs.

Major OEM chips on a low-profile stick

Chips are sourced from major OEM suppliers Samsung, Micron or Hynix, assembled to meet enterprise-grade quality standards. The absence of a heat spreader keeps the module height minimal for the tight SODIMM slots inside the iMac enclosure. Installation is straightforward using the user-accessible memory compartment on the rear of the system.

How it compares

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

Price $155.99
Cheaper than about 61% 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.
Price per GB $4.87 per GB
Cheaper than about 78% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineApple iMac/Mac Mini Compatible Series Memory
Model nameApple DDR4 2666 MHz Non-ECC Unbuffered SODIMM
Part numberMS21300-328K1
Total capacity32 GB
Product type260-Pin DDR4 SODIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL19
ECC supportNo
Buffer typeUnbuffered
Heat spreaderNo
Memory rank2Rx8
Power
Rated voltage1.2 V
Compatibility
Compatible systemsApple
In the box
Included items32 GB (1 × 32 GB) DDR4 2666 MHz PC4-21300 2Rx8 1.2 V CL19 260-PIN Non-ECC Unbuffered SODIMM

Questions about this item

Does the 1.2V DDR4 2666 SODIMM run cool and quiet during all-day workloads in the 27-inch 5K iMac?

The module operates at 1.20V with no heat spreader, matching the iMac's original low-voltage DDR4 2666 specification so it produces no extra heat or fan noise under sustained load.

What must the iMac already have for this 260-pin SODIMM to install and be recognised?

The 27-inch Retina 5K iMac Mid 2020 (iMac 20,1 or 20,2) with user-accessible SO-DIMM slots and the latest macOS installed will detect the 32GB PC4-21300 CL19 module automatically.

How does the CL19 2Rx8 module behave when paired with Apple's factory DDR4 2666 memory in the same iMac?

The system will run all populated slots at DDR4 2666 CL19; the 2Rx8 organisation is compatible with Apple's original memory timing so no manual configuration is required.

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