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Two green DDR4 SODIMM sticks with black chips, no heat spreader

Computer Memory Solutions

Computer Memory Solutions 16GB (2x8GB) DDR4 2400 CL17 SODIMM iMac 21.5 4K 2017

SKU CH-DF64-14KG9

16 GB kit of two 8 GB DDR4 2400 CL17 SO-DIMM modules for the 21.5-inch 4K iMac (Mid-2017)

  • Total capacity16 GB (2 × 8 GB)
  • Rated speedDDR4 2400 (PC4 19200)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL17
  • Memory timings17-17-17
  • Rated voltage1.2 V
  • 16 GB dual-channel kit boosts multitasking headroom for the 21.5-inch 4K iMac
  • DDR4 2400 CL17 timing keeps latency low at standard 1.2 V
  • Two 8 GB unbuffered SODIMMs fill both slots up to the 32 GB maximum
  • 260-pin non-ECC modules guaranteed compatible with iMac18,2 MNE02LL/A
  • Major-brand chipset and lifetime exchange warranty protect the upgrade investment

Targeted Upgrade Kit

This 16GB kit contains two 8GB DDR4 2400 SO-DIMM modules built for the 21.5-inch 4K iMac released in mid-2017. It matches the factory specifications for model MNE02LL/A and identifier iMac18,2. The unbuffered, non-ECC sticks run at 1.2V with CL17 timings and a 2Rx8 rank configuration.

Capacity Step-Up

The iMac ships with two populated slots and a 32GB ceiling, so this kit doubles the common 8GB baseline without exceeding the limit. It is the logical step when the original memory leaves headroom for heavier multitasking or larger project files. Buyers already at the 32GB maximum gain no further capacity from this kit.

DDR4 SO-DIMM Constraints

The 260-pin DDR4 interface is fixed by the logic board; no other generation or pin count will seat in the slots. Speed is locked to 2400 MT/s by the memory controller, so faster modules simply downclock. The two-slot layout means total capacity cannot surpass 32GB regardless of module density.

How it compares

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

Price $69.99
Cheaper than about 73% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB (2 × 8 GB)
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $4.37 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 nameComputer Memory Solutions
Model nameCM1024642400SO
Total capacity16 GB (2 × 8 GB)
Product type260-Pin DDR4 SO-DIMM
Performance
Rated speedDDR4 2400 (PC4 19200)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL17
Memory timings17-17-17
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsApple iMac "Core i5 in 3.4 21.5 in (4K, Mid-2017) MNE02LL/A
In the box
Included items2 Memory RAM Sticks

Questions about this item

Will the 260-pin SODIMM modules fit the two memory slots inside the 21.5-inch 4K iMac from mid-2017?

Yes, the kit contains two 260-pin DDR4 SO-DIMM sticks designed for the two slots in the iMac18,2 (A1418) model.

What is the correct way to seat each 8 GB stick so the iMac recognises the full 16 GB?

Insert each module at a slight angle until the gold contacts disappear, then press down firmly until the side clips click — partial seating is the most common reason the system only sees 8 GB.

If a stick fails years later, what replacement does the manufacturer offer?

Computer Memory Solutions provides a limited lifetime exchange or repair warranty against manufacturing defects when purchased directly from them.

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