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Green rectangular DDR4 SODIMM module with black chips, 260 gold pins, no heat spreader

NEMIX RAM

NEMIX RAM 8GB DDR4 2400 CL17 260-PIN SODIMM Apple iMac 21.5" 4K Mid 2020 memory upgrade

SKU CH-8TX2-JF9NJ

8GB DDR4 2400 CL17 SODIMM module upgrades the 21.5" 4K iMac (Mid 2020) with 1.2V unbuffered memory

  • Total capacity8 GB
  • Rated speedDDR4 2400 (PC4 19200)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL17
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • 8GB capacity expands iMac 21.5" 4K Mid 2020 multitasking headroom
  • DDR4 2400 PC4-19200 speed matches factory memory specification
  • CL17 CAS latency keeps timing consistent with original modules
  • 20V low voltage reduces power draw and heat in slim all-in-one
  • 260-pin SODIMM form factor fits Apple iMac memory slots directly

iMac 21.5″ 4K Mid 2020 upgrade

This 8 GB DDR4 SODIMM is built specifically for the Apple 21.5-inch iMac with Retina 4K display released in Mid 2020. It provides a single-module capacity increase for users who need more memory for everyday multitasking and creative applications. The module matches the system's required 260-pin form factor and 1.2 V operating voltage.

Tool-free slot access

Installation requires opening the memory compartment door on the rear of the iMac and pressing the module into the SODIMM slot until it clicks. The most common issue is incomplete seating, which causes the system to report no memory or fail to boot; reseating firmly usually resolves it. No drivers or firmware updates are needed for the module to be recognised.

Steady throughput for long sessions

The memory runs at 2400 MT/s with CL17 latency and 2Rx8 organisation, delivering consistent bandwidth during extended rendering, compilation or virtual-machine workloads. Major-brand Samsung, Micron or Hynix chips are stress-tested under load to maintain stability without throttling. The unbuffered non-ECC design keeps latency low for sustained interactive use.

How it compares

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

Price $42.99
Cheaper than about 79% of the 21,161 comparable items (median $397.99).
Total capacity 8 GB
Lower than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $5.37 per GB
Cheaper than about 72% 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 nameNEMIX RAM
Product lineApple iMac/Mac Mini Compatible Series Memory
Model nameApple DDR4 2666 MHz ECC Unbuffered SODIMM
Part numberMS19200-828K1
Total capacity8 GB
Product type260-PIN DDR4 SODIMM
Performance
Rated speedDDR4 2400 (PC4 19200)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL17
ECC supportNo
Buffer typeUnbuffered
Heat spreaderNo
Memory rank2Rx8
Power
Rated voltage1.2 V
Compatibility
Compatible systemsApple
In the box
Included items8 GB (1 × 8 GB) DDR4 2400 MHz PC4-19200 2Rx8 1.2 V CL17 260-PIN Non-ECC Unbuffered SODIMM

Questions about this item

How can I confirm the 2400 MHz CL17 module is running at its rated speed after installing it in my 21.5" 4K iMac Mid 2020?

Open About This Mac and click System Report; under Memory the installed SODIMM should show 2400 MHz, DDR4, and a CAS latency of 17.

What comes in the package and is any extra hardware required for the installation?

The box contains one 8 GB 260-pin DDR4 SODIMM (PC4-19200, 1.2 V, 2Rx8, CL17). No additional parts or tools are needed beyond what the iMac requires for memory access.

Should I choose the 2400 MHz CL17 version or the 2666 MHz ECC version listed in the specifications?

Select the 2400 MHz CL17 non-ECC SODIMM (part MS19200-828K1); it matches the Mid 2020 21.5" iMac's memory controller, while the 2666 MHz ECC module is a different configuration.

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