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Green rectangular circuit board with gold edge connectors and black memory chips, no heat spreader

A-Tech

A-Tech 64GB DDR4 2666MHz ECC RDIMM 288-Pin iMac Pro Late 2017 Memory Upgrade

SKU CH-JQDW-6F9EJ

A 64GB DDR4 2666MHz ECC registered DIMM for upgrading a 27-inch iMac Pro from Late 2017

  • Total capacity64 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2S2Rx4 (4Rx4)
  • 64 GB capacity expands multitasking headroom for demanding workflows
  • DDR4 2666 MHz speed accelerates data throughput for responsive performance
  • ECC registered design detects and corrects memory errors automatically
  • 288-pin RDIMM form factor fits iMac Pro Late 2017 memory slots precisely
  • 20 V operation reduces power draw while maintaining stability

System-Specific 64 GB DDR4 Module

This single 64 GB DDR4 2666 MHz ECC registered DIMM is built for the Apple iMac Pro (Retina 5K, 27-inch, Late 2017). It targets owners of that specific workstation who need to expand memory capacity with a module validated for the platform.

Registered ECC with 4Rx4 Rank

The module runs at DDR4 2666/2667 MHz (PC4-21300) with 1.20 V operation, ECC registered signalling and a 2S2Rx4 (4Rx4) rank configuration. These electrical and organisational parameters must match the iMac Pro’s memory controller requirements for the system to recognise and stabilise the upgrade.

Direct DIMM Slot Installation

Installation consists of opening the iMac Pro’s memory access door and seating the 288-pin RDIMM into an available slot; no heat spreader is present, so clearance is not a concern. Builders who need more than one module must verify the total slot count and maximum supported capacity for their exact model before purchasing additional units.

How it compares

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

Price $269.99
Cheaper than about 55% of the 21,161 comparable items (median $397.99).
Total capacity 64 GB
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $4.22 per GB
Cheaper than about 83% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameA-Tech
Product lineA-Tech DDR4 Apple Mac RAM Memory Upgrades
Total capacity64 GB
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor Brand Chipset
Memory
ECC supportYes
Buffer typeRegistered
Memory rank2S2Rx4 (4Rx4)
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsApple Mac Systems

Questions about this item

What does the 64GB capacity mean for my iMac Pro Late 2017 in daily use?

A single 64GB module adds that full amount to your iMac Pro (Retina 5K, 27-inch, Late 2017), letting you run larger datasets, virtual machines and creative projects without hitting memory limits.

How does the DDR4 2666 PC4-21300 spec translate to real bandwidth on this machine?

The module runs at 2666/2667 MHz delivering up to 21300 MB/s peak transfer rate on the iMac Pro's memory controller, matching the system's native DDR4 speed.

Will the 288-pin RDIMM form factor fit the iMac Pro Late 2017 memory slots?

Yes, this 288-pin DDR4 RDIMM is built to the exact mechanical and electrical spec for the iMac Pro (Retina 5K, 27-inch, Late 2017) model A1862 (EMC 3144).

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