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Two green circuit boards with black memory chips and gold edge connectors

Computer Memory Solutions

Computer Memory Solutions 32GB (2x16GB) DDR4 2400 CL17 SODIMM for iMac 27" 5K Mid-2017

SKU CH-EXJ8-365EM

A 32 GB DDR4 kit of two 16 GB SODIMM modules rated at 2400 MHz CL17 for the 27-inch 5K iMac (Mid-2017)

  • Capacity32GB (2 x 16GB)
  • Type260-Pin DDR4 SO-DIMM
  • SpeedDDR4 2400 (PC4 19200)
  • CAS LatencyCL17
  • Timing17-17-17
  • Voltage1.2V
  • 32 GB total capacity from two 16 GB modules for demanding multitasking
  • DDR4 2400 speed rated at PC4 19200 for responsive system performance
  • CL17 latency with 17-17-17 timing for stable operation
  • 2 V low-voltage design reduces power draw and heat
  • 260-pin SO-DIMM form factor built for the 27-inch 5K iMac Mid-2017

32 GB DDR4 kit for 27-inch iMac 5K Mid-2017

This 32 GB kit contains two 16 GB DDR4 2400 SO-DIMM modules built to the exact specification Apple used in the 27-inch 5K iMac released in mid-2017. It is intended for owners of that model who want to reach the machine's 64 GB ceiling without mixing module sizes.

Thermals noise and power draw

Each stick runs at the standard 1.2 V DDR4 voltage and carries no heat spreader, so the modules rely on the iMac's existing airflow. The unbuffered, non-ECC design adds no active components, meaning power draw and acoustic profile remain identical to the factory-installed memory.

What the bundle changes

The package supplies a matched pair of 16 GB sticks, letting you populate two of the four slots in a single step and leave the other two free for a future upgrade to 64 GB. Computer Memory Solutions validates every module against the target iMac and backs the kit with a limited lifetime warranty when purchased directly.

Highlights

  • 32 GB total capacity from two 16 GB modules for demanding multitasking
  • DDR4 2400 speed rated at PC4 19200 for responsive system performance
  • CL17 latency with 17-17-17 timing for stable operation
  • 2 V low-voltage design reduces power draw and heat
  • 260-pin SO-DIMM form factor built for the 27-inch 5K iMac Mid-2017

Specifications

BrandComputer Memory Solutions
ModelCM2048642400SO
Capacity32GB (2 x 16GB)
Type260-Pin DDR4 SO-DIMM
SpeedDDR4 2400 (PC4 19200)
CAS LatencyCL17
Timing17-17-17
Voltage1.2V
ECCNo
Buffered/RegisteredUnbuffered
Rank2Rx8
ChipsetMajor Brand Chipset
Heat SpreaderNo
Compatible SystemApple iMac Core i7 4.2 27-Inch (5K, Mid-2017)
Package Content2 Memory RAM Sticks

Questions about this item

How do I install the 260-pin DDR4 SO-DIMM modules in the 27-inch 5K iMac (Mid-2017) and which step is often missed?

Power off and unplug the iMac, lay it face-down on a soft cloth, press the button under the power port to open the memory door, eject any existing modules by pulling the side levers outward, align each 260-pin stick's notch with the slot key, press firmly until the levers click back, then close the door before reconnecting power.

What maintenance or replacement will the 32 GB (2×16 GB) DDR4 2400 CL17 kit need over time?

No routine maintenance is required; the unbuffered non-ECC modules have no moving parts or batteries. If a stick ever fails, the limited lifetime warranty from Computer Memory Solutions covers repair or exchange for the original purchaser.

What limit appears first during sustained heavy workloads with this 1.2 V 2Rx8 DDR4 2400 memory?

The memory controller in the 4.2 GHz Core i7 iMac caps usable speed at 2400 MT/s, so bandwidth tops out at the PC4-19200 rating; thermals stay within spec because the SODIMMs run at standard 1.2 V without a heat spreader.

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