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
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

  • Capacity4GB
  • Type260-Pin DDR4 SO-DIMM
  • SpeedDDR4 2400 (PC4 19200)
  • CAS LatencyCL17
  • Timing17-17-17
  • Voltage1.2V
  • 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.

Highlights

  • 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

Specifications

BrandComputer Memory Solutions
ModelCM512642400SO
Capacity4GB
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 Retina 5K, 27-inch (2017)
Package Content1Memory 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.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.