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Two green circuit boards with black chips, gold edge connectors, no heat spreaders

NEMIX RAM

NEMIX RAM 32GB (2×16GB) DDR4 2400 CL17 SODIMM memory upgrade for Apple 21.5" iMac 4K Mid 2020

SKU CH-F22Q-YTMQ1

A 32 GB DDR4 SODIMM kit running at 2400 MT/s with CL17 latency, built for the 21.5" iMac 4K Mid 2020

  • Total capacity32 GB (2 × 16 GB)
  • Rated speedDDR4 2400 (PC4 19200)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL17
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • 32 GB dual-channel kit doubles usable memory for demanding workloads
  • DDR4 2400 MT/s CL17 timing keeps latency low for responsive multitasking
  • 20 V operation reduces power draw and heat inside the compact chassis
  • 260-pin SODIMM form factor fits the 21.5" iMac 4K Mid 2020 memory slots exactly
  • Major-brand Samsung, Micron or Hynix ICs tested under load for rock-solid stability

Compatible 21.5" iMac 4K memory kit

This 32GB kit contains two 16GB SODIMM modules built for the Apple 21.5" iMac with Retina 4K Display Mid 2020. It runs at DDR4 2400 with CL17 latency and 1.2V operation. The 260-pin unbuffered non-ECC design matches the factory slot specification. Installation is a straightforward user upgrade.

Suits owners of the specified iMac model

Buyers with a different iMac size, a different year or a Mac mini should verify their exact model before purchasing. Systems that require ECC registered memory or a DIMM form factor cannot use these SODIMM modules. The kit is not intended for Windows laptops or desktop motherboards.

Deciding specification is the 260-pin DDR4 2400

The iMac Mid 2020 accepts only 260-pin DDR4 SODIMM modules at 2400MT/s with 1.2V unbuffered non-ECC signalling. A module with a different pin count, voltage, speed grade or ECC type will not fit or boot. Matching these exact parameters ensures compatibility.

How it compares

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

Price $140.99
Cheaper than about 63% of the 21,161 comparable items (median $397.99).
Total capacity 32 GB (2 × 16 GB)
Typical for this category: the median of 20,941 items is 32 GB.
Price per GB $4.41 per GB
Cheaper than about 82% 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 Non-ECC Unbuffered SODIMM
Part numberMS19200-628K2
Total capacity32 GB (2 × 16 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 items32 GB (2 × 16 GB) DDR4 2400 MHz PC4-19200 2Rx8 1.2 V CL17 260-PIN Non-ECC Unbuffered SODIMM KIT

Questions about this item

Does the 21.5-inch iMac 4K Mid 2020 need any tools or extra parts to install these 260-pin SODIMM modules?

The iMac uses a memory compartment door on the rear; no tools are required beyond a soft cloth to protect the screen while you lay the computer face-down.

Will these CL17 2400 MHz sticks run at their rated speed if the original 2666 MHz Apple modules stay installed?

The iMac has only two SODIMM slots, so the 2 x 16 GB kit replaces the factory memory entirely — there is no mixing of old and new modules.

How can I confirm the 32 GB kit is detected at 2400 MHz with CL17 timings after installation?

Open About This Mac → System Report → Memory; each slot should show 16 GB DDR4 2400 MHz, and the Part Number field will list MS19200-628K2.

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