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Four green circuit boards with black chips, 260-pin SODIMM form factor, no heat spreaders

Computer Memory Solutions

Computer Memory Solutions CM2048642400SO 64GB (4x16GB) DDR4 2400MHz CL17 260-pin SODIMM memory upgrade

SKU CH-EPTF-SQBBM

A 64GB kit of four 16GB DDR4 2400MHz SODIMM modules built for the 27-inch 5K iMac with 4.2GHz Core i7 from mid-2017

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR4 2400 (PC4 19200)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL17
  • Memory timings17-17-17
  • Rated voltage1.2 V
  • 64GB total capacity from four 16GB modules
  • 2400MHz DDR4 speed rated at PC4-19200
  • CL17 latency with 17-17-17 timing
  • 2V low-voltage operation for efficiency
  • Designed for 27-inch 5K iMac (Mid-2017)

Compatible iMac Memory Kit

This 64 GB kit contains four 16 GB DDR4 2400 MHz SO-DIMM modules built for the Apple iMac Core i7 4.2 27-Inch 5K Mid-2017. Each stick is a 260-pin unbuffered non-ECC module rated at CL17 and 1.2 V. The kit fills all four memory slots to reach the system maximum of 64 GB.

Suitable For Mac Upgraders Only

Owners of the specified 27-inch 5K iMac from 2017 who need the full 64 GB capacity will use every slot. Users with other iMac models, Windows laptops or desktop motherboards should look elsewhere because the modules are validated only for that single Apple system. Buyers who need ECC or registered memory cannot use this kit.

Check Your iMac Model First

Verify that your machine is the exact Core i7 4.2 27-Inch 5K Mid-2017 configuration before ordering. Confirm the system currently has four SO-DIMM slots free or that you are prepared to replace existing modules. Ensure the operating system and firmware are up to date so the full 64 GB is recognised.

How it compares

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

Price $442.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 64 GB (4 × 16 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $6.92 per GB
Cheaper than about 58% 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 capacity64 GB (4 × 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 i7 in 4.2 27 in (5K, Mid-2017)
In the box
Included items4 Memory RAM Sticks

Questions about this item

Will my Apple iMac "Core i7" 4.2 27-Inch (5K, Mid-2017) accept all four 16GB modules to reach 64GB?

Yes, the iMac has four SO-DIMM slots and supports a maximum of 64GB, so this 4x16GB kit fills every slot.

Can I keep any existing DDR4 2400MHz CL17 sticks while adding this kit?

Mixing is possible only if the old modules match the 2400MHz speed, CL17 timing, 1.2V voltage, and 2Rx8 rank; otherwise the system will downclock or become unstable.

How do I verify the kit runs at 2400MHz with CL17 after installation?

Open the macOS System Report or a utility like CPU-Z and confirm the memory shows DDR4-2400, CAS 17-17-17, and 1.2V across all four slots.

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