We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Two green circuit boards with black memory chips, no heat spreaders, 260-pin SODIMM form factor

Computer Memory Solutions

Computer Memory Solutions CM2048642400SO 32GB (2x16GB) DDR4 2400 CL17 1.2V 2Rx8 SODIMM for iMac 21.5 4K 2017

SKU CH-NC2H-M00VQ

A 32 GB DDR4 kit with two 16 GB SO-DIMM modules at 2400 MHz CL17 for the 21.5-inch 4K iMac from mid-2017

  • Total capacity32 GB (2 × 16 GB)
  • Rated speedDDR4 2400 (PC4 19200)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL17
  • Memory timings17-17-17
  • Rated voltage1.2 V
  • 32 GB dual-channel kit doubles usable memory for the 2017 iMac
  • DDR4 2400 MHz speed matches the factory specification exactly
  • CL17 timing with 1.2 V operation keeps power draw low
  • 2Rx8 unbuffered non-ECC modules fit the 260-pin SO-DIMM slots
  • Guaranteed compatible with the 21.5-inch 4K iMac MNDY2LL/A

System-Specific DDR4 SO-DIMM Kit

This 32 GB kit contains two 16 GB DDR4 SO-DIMM modules rated at 2400 MHz with CL17 timings and 1.2 V operation. It is built specifically for the Apple iMac 21.5-inch 4K Mid-2017 model MNDY2LL/A using a 260-pin unbuffered non-ECC design. The 2Rx8 rank configuration matches the original system requirements for reliable recognition.

Upgrade From Factory 8 GB or 16 GB

The Mid-2017 21.5-inch 4K iMac ships with 8 GB or 16 GB of soldered or slotted memory depending on configuration. Installing this 32 GB kit replaces the removable slots and raises total capacity to 32 GB or 40 GB when combined with any soldered memory. The jump is worthwhile for users running virtual machines, large photo libraries or 4K video timelines that exceed the original memory ceiling.

DDR4 SO-DIMM Slot and Capacity Limits

The iMac 21.5-inch 4K Mid-2017 provides two user-accessible SO-DIMM slots supporting a maximum of 64 GB across both sockets. This kit occupies both slots with 16 GB modules, leaving no room for further expansion without removing a stick. Buyers who want more than 32 GB total must purchase a 64 GB kit instead.

How it compares

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

Price $164.99
Cheaper than about 60% 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 $5.16 per GB
Cheaper than about 75% 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 nameCM2048642400SO
Total capacity32 GB (2 × 16 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 3.0 21.5 in (4K, Mid-2017) MNDY2LL/A
In the box
Included items2 Memory RAM Sticks

Questions about this item

Does the 260-pin DDR4 SODIMM fit the memory slots in the 21.5-inch 4K iMac from mid-2017?

Yes, the 260-pin DDR4 SODIMM form factor matches the four SO-DIMM slots inside the 21.5-inch 4K iMac (Mid-2017) for a direct fit.

What is the correct way to seat both 16 GB sticks so the iMac recognises the full 32 GB?

Power off and unplug the iMac, remove the bottom access door, insert each module at an angle until the gold contacts disappear, then press down firmly until both side clips click into place.

Will the memory need any firmware updates or battery changes to keep working in this iMac?

No firmware updates or battery maintenance are required; the DDR4 modules run at 1.2 V without ECC and are covered by a limited lifetime warranty against manufacturing defects.

More in Model-Specific Memory Upgrades

Similar items