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Two green circuit-board SODIMM sticks, black chips, gold edge connectors

NEMIX RAM

NEMIX RAM 32GB (2×16GB) DDR4 2666 CL19 SODIMM for Apple iMac 21.5" 4K Mid 2020 memory upgrade

SKU CH-N5XX-09EZZ

A 32 GB dual-channel DDR4 2666 kit with two 16 GB SODIMMs at CL19 for the 21.5-inch 4K iMac from mid 2020

  • Capacity32GB (2 x 16GB)
  • SpeedDDR4 2666 (PC4 21300)
  • ECCNo
  • Buffered/RegisteredUnbuffered
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • Voltage1.20V
  • 32 GB kit (2×16 GB) doubles iMac capacity
  • DDR4 2666 MHz CL19 matches factory spec
  • 2 V low voltage keeps thermals in check
  • 260-pin SODIMM drops straight into 21.5" 4K Mid 2020
  • Major-brand chips tested under load for stability

Apple iMac 21.5" 4K Mid 2020 DDR4 upgrade

This 32GB kit contains two 16GB DDR4 2666 SODIMM modules built for the Apple iMac 21.5" 4K Mid 2020. It uses 260-pin unbuffered non-ECC memory at 1.20V with CL19 latency. The kit targets owners of that specific all-in-one who need more system memory.

Tool-free access with firmware limits

The iMac 21.5" 4K Mid 2020 requires removing the display panel to reach the SODIMM slots, so installation is not tool-free. Apple firmware only recognises JEDEC-standard timings; modules with XMP profiles will default to 2666 CL19. Incorrect seating or mixed ranks are the usual cause of a no-boot condition.

Steady throughput for long renders

Under sustained workloads the modules run at their rated 2666 speed and 1.20V without throttling, because they have no heat spreader and rely on the iMac's internal airflow. The 2Rx8 organisation keeps bandwidth stable during extended video exports or virtual-machine sessions, delivering consistent frame times rather than burst peaks.

Highlights

  • 32 GB kit (2×16 GB) doubles iMac capacity
  • DDR4 2666 MHz CL19 matches factory spec
  • 2 V low voltage keeps thermals in check
  • 260-pin SODIMM drops straight into 21.5" 4K Mid 2020
  • Major-brand chips tested under load for stability

Specifications

BrandNEMIX RAM
SeriesApple iMac/Mac Mini Compatible Series Memory
ModelApple DDR4 2666MHZ Non-ECC Unbuffered SODIMM
Part NumberMS21300-628K2
Capacity32GB (2 x 16GB)
SpeedDDR4 2666 (PC4 21300)
ECCNo
Buffered/RegisteredUnbuffered
ChipsetMajor OEM Samsung, Micron, Hynix
Voltage1.20V
Compatible SystemApple
CAS LatencyCL19
Heat SpreaderNo
Type260-Pin DDR4 SODIMM
Rank2Rx8
FeaturesDDR4 Non-ECC Unbuffered SODIMM Motherboard Compatible
Package Content32GB (2X16GB) DDR4 2666MHZ PC4-21300 2Rx8 1.2V CL19 260-PIN Non-ECC Unbuffered SODIMM KIT

Questions about this item

How can I verify the kit is running at 2666 MHz CL19 after installing it in my 21.5" iMac 4K Mid 2020?

Open About This Mac and check the Memory tab — it should show 32 GB DDR4 2666 MHz; System Report will confirm CL19 timing and 1.2 V operation.

What comes in the package and do I need any extra tools for the 21.5" iMac 4K Mid 2020 upgrade?

The box contains two 16 GB 260-pin DDR4 SODIMM modules; no additional parts are required, but a Torx screwdriver is needed to open the iMac memory door.

Why choose this 32 GB 2×16 GB CL19 kit instead of a single 32 GB stick for the 21.5" iMac 4K Mid 2020?

The iMac uses dual-channel architecture; a matched 2×16 GB kit ensures full bandwidth, while a single 32 GB module would run in single-channel mode.

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