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Green printed circuit board with black memory chips and gold edge connector

Timetec

Timetec MR-H16D424S7E 16GB DDR4 2400 CL17 SODIMM laptop RAM

SKU CH-CSEC-AFMPD

A 16 GB DDR4 2400 CL17 SODIMM module built with Hynix ICs for 2017 iMac 21.5-inch and 27-inch Retina models

  • Total capacity16 GB
  • Rated speedDDR4 2400 (PC4 19200)
  • CAS latencyCL17
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Product type260-Pin DDR4 SO-DIMM

Capacity 16GB

  • 16 GB capacity boosts multitasking headroom for demanding workloads
  • DDR4 2400 speed delivers 19200 MB/s bandwidth for responsive performance
  • CL17 latency keeps data access quick and consistent
  • 2 V operation reduces power draw and heat in tight chassis
  • 260-pin SODIMM form factor fits 2017 iMac 21.5" and 27" Retina models

What this module is

This is a 16GB DDR4 SODIMM rated at 2400MHz with CL17 latency and 1.2V operation. It uses Hynix ICs and an unbuffered non-ECC design built for 260-pin laptop slots. The module measures 30mm by 69.6mm and is intended for memory upgrades in compatible Apple iMac models from 2017.

Check before ordering

Verify that your iMac is a 21.5-inch or 27-inch Mid 2017 model listed in the compatibility data, such as iMac 18,1, 18,2 or 18,3 with part numbers like MMQA2LL/A, MNDY2LL/A or MNE92LL/A. Confirm the system accepts DDR4 2400 SO-DIMMs and that you have a free slot, because the 21.5-inch Retina 4K models support a maximum of 32GB total capacity.

Thermals and power

Operating at 1.2V keeps power draw low and heat output minimal inside the compact all-in-one chassis. The module runs at standard JEDEC voltage without overclocking, so it does not add noticeable thermal load or require active cooling beyond the iMac's existing airflow design. Unbuffered non-ECC operation contributes to stable, quiet performance in daily workloads.

How it compares

Measured against everything we stock in Laptop RAM, at today’s prices. Recalculated every night.

Price $75.99
Typical for this category: the median of 2,079 items is $70.99.
Total capacity 16 GB
Typical for this category: the median of 1,886 items is 16 GB.
Price per GB $4.75 per GB
Cheaper than about 70% of the 1,886 comparable items (median $5.94 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 nameTimetec
Model nameMR-H16D424S7E
Total capacity16 GB
Product type260-Pin DDR4 SO-DIMM
Performance
Rated speedDDR4 2400 (PC4 19200)
Memory
CAS latencyCL17
ECC supportNo
Buffer typeUnbuffered
Power
Rated voltage1.2 V

Other versions of this model

5 more in the same range

Questions about this item

What comes inside the box and is anything else required?

The box contains a single 16GB DDR4 2400 CL17 SODIMM module. No extra parts or tools are needed for installation.

Which capacity version should I pick for a 2017 iMac 27-inch Retina 5K?

This 16GB module is listed as compatible; the system maximum is 32GB so two modules can be used.

What does the 2400MHz rating mean once the module is installed?

The memory will run at 2400MHz with CL17 latency at 1.2V, matching the iMac's DDR4 specification.

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