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Green circuit board with black memory chips and gold edge connector

Computer Memory Solutions

Computer Memory Solutions CM512642400SO 4GB DDR4 2400 SODIMM Apple iMac Retina 5K 27-inch 2017

SKU CH-974A-BW65X

4GB DDR4 2400 SODIMM module upgrades the 27-inch 2017 iMac Retina 5K with CL17 timing at 1.2V

  • Total capacity4 GB
  • Rated speedDDR4 2400 (PC4 19200)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL17
  • Memory timings17-17-17
  • Rated voltage1.2 V
  • 4 GB capacity adds headroom for multitasking
  • 2400 MHz DDR4 speed matches iMac 2017 spec
  • CL17 timing delivers responsive data access
  • 260-pin SODIMM fits the 27-inch Retina 5K slot
  • 2 V operation keeps power draw low

Designed for 2017 27-inch iMac Retina 5K

This 4 GB DDR4 2400 SO-DIMM module is built to match the memory specification of the Apple iMac Retina 5K 27-inch 2017. It runs at 1.2 V with CL17 timing and uses a 260-pin unbuffered non-ECC layout. The single stick installs directly into one of the system's four slots.

Suits owners adding or replacing a single module

The kit contains one 4 GB stick, so buyers needing the full 64 GB maximum must purchase additional units separately. Systems that require ECC or registered memory will not work with this unbuffered non-ECC design. Buyers with other Mac models should verify compatibility before ordering.

No extra accessories or software included

The package supplies only the memory stick itself. There are no heat spreaders, cables, adapters or configuration utilities in the box. Installation relies on the iMac's own firmware to recognise the new module at 2400 MHz.

How it compares

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

Price $20.99
Cheaper than about 90% of the 21,161 comparable items (median $397.99).
Total capacity 4 GB
Lower than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $5.25 per GB
Cheaper than about 73% 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 nameCM512642400SO
Total capacity4 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 Retina 5K, 27 in (2017)
In the box
Included items1Memory Ram Stick

Questions about this item

My iMac Retina 5K 27-inch 2017 has four slots — can I add this 4GB module alongside the original memory?

Yes, the iMac Retina 5K 27-inch 2017 supports up to 64GB across four slots, so this 4GB DDR4 2400 SODIMM can be installed with existing modules.

After installing this CM512642400SO stick, how do I verify it runs at the rated 2400MHz CL17?

Open About This Mac → System Report → Memory; the new module should show 4GB, DDR4, 2400MHz, and the system will report total capacity up to 64GB.

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