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Green circuit board SODIMM module with black memory chips, no heat spreader

NEMIX RAM

NEMIX RAM 16GB DDR4 2666MHz CL19 2Rx8 1.2V 260-pin SODIMM for Apple iMac 21.5" 2020

SKU CH-MRVY-6P4BP

16 GB DDR4 2666 MHz CL19 SODIMM module built for the 21.5 inch 2020 iMac

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • 16GB DDR4 2666MHz boosts iMac 21.5" 2020 responsiveness
  • CL19 2Rx8 1.2V operation keeps power draw low
  • 260-pin SODIMM form factor fits Apple mid-2020 slot exactly
  • Samsung Micron Hynix chips deliver tested stability under load
  • Non-ECC unbuffered design matches original iMac memory specification

Compatibility Focus

This 260-pin DDR4 SODIMM is built for the Apple 21.5-inch iMac with Retina 4K display released in 2020. It targets owners of that specific all-in-one desktop who need to expand system memory beyond the factory configuration.

Single Module Impact

The package delivers one 16 GB stick rated at 2666 MHz with CL19 latency and 1.2 V operation. Adding this module increases total capacity directly, allowing the iMac to handle larger workloads and more simultaneous applications without relying on slower storage swapping.

Build and Connector Reality

Chips come from major OEM sources such as Samsung, Micron or Hynix and carry no heat spreader, keeping the profile slim for the tight SODIMM slot. The 2Rx8 rank organisation and unbuffered non-ECC design match the iMac’s memory controller requirements for stable daily operation.

How it compares

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

Price $66.99
Cheaper than about 73% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $4.19 per GB
Cheaper than about 83% 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 numberMS21300-628K1
Total capacity16 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 items16 GB (1 × 16 GB) DDR4 2666 MHz PC4-21300 2Rx8 1.2 V CL19 260-PIN Non-ECC Unbuffered SODIMM

Questions about this item

Will the 2Rx8 DDR4 SODIMM need any firmware updates or periodic reseating after installation?

No firmware updates are required for this DDR4 2666 CL19 module, and the 260-pin SODIMM stays firmly seated once installed in the 21.5" 2020 iMac.

What is the first limit reached when the 16 GB module runs at full 2666 MHz speed continuously?

The CAS latency of CL19 at 1.20 V sets the timing ceiling, so sustained throughput is bounded by those fixed latency cycles.

How much heat and fan noise does the 1.2 V 2Rx8 stick add during all-day workloads?

The module runs at standard 1.2 V without a heat spreader, so it adds minimal thermal load and no audible noise inside the iMac chassis.

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