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Four green DDR4 RDIMM sticks in a clear tray

NEMIX RAM

NEMIX RAM 64GB (4x16GB) DDR4 2666MHz ECC RDIMM CL19 1.2V 288-pin Apple iMac Pro 2017-2021 memory upgrade

SKU CH-PTX1-S88FQ

A 64 GB kit of four 16 GB DDR4 2666 MHz ECC registered DIMMs built for Apple iMac Pro models from 2017 to 2021

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V
  • 64 GB kit expands iMac Pro memory capacity
  • DDR4 2666 MHz speed matches original system specification
  • ECC registered design protects data integrity under load
  • 2 V operation keeps power draw low
  • Four 16 GB modules fill all slots for full upgrade

iMac Pro 2017-2021 memory kit

This 64GB kit contains four 16GB DDR4 2666MHz ECC RDIMM modules built for the Apple iMac Pro 2017-2021. It targets professionals who need registered, error-correcting memory to keep workstations stable under sustained loads. The modules run at 1.2V with CL19 latency and use a 288-pin form factor.

Installation and common issues

The DIMMs slot into the iMac Pro memory compartment after removing the access door; no tools are required beyond a soft cloth. Because the system expects registered ECC RDIMMs, mixing unbuffered or non-ECC sticks will prevent boot. Ensure all four slots are populated with identical 1Rx4 modules for full compatibility.

Registered ECC RDIMM requirement

The single specification that decides fit is the registered ECC RDIMM design with 1Rx4 organisation. Standard desktop UDIMMs or SO-DIMMs will not work in this workstation. Buyers who need non-ECC or unregistered memory for other Mac models should look elsewhere.

How it compares

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

Price $379.99
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 $5.94 per GB
Cheaper than about 66% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineApple iMac/Mac Mini Compatible Series Memory
Model nameApple DDR4 2666 MHz ECC RDIMM Registered Server Memory
Part numberMR21300-614K4
Total capacity64 GB (4 × 16 GB)
Product type288-Pin DDR4 RDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Heat spreaderNo
Memory rank1Rx4
Power
Rated voltage1.2 V
Compatibility
Compatible systemsApple
In the box
Included items64 GB (4 × 16 GB) DDR4 2666 MHz PC4-21300 1Rx4 1.2 V CL19 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

How can I verify the 64GB kit is running at 2666MHz with ECC after installing it in my iMac Pro?

Open System Report in macOS and confirm each 16GB module shows DDR4 2666, ECC enabled, and registered type under the Memory section.

What modules are included and is any extra hardware needed for the upgrade?

The box contains four 16GB DDR4 2666MHz ECC RDIMM sticks; no additional brackets, tools or cables are required for the iMac Pro memory slots.

Which capacity kit should I choose if I want the maximum supported 64GB for iMac Pro 2017-2021?

This 64GB kit (4x16GB) fills all four slots and matches the highest factory-supported capacity for those models.

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