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Eight silver DDR4 RDIMM sticks with black chips and gold contacts

A-Tech

A-Tech 256GB Kit (8x32GB) DDR4 2666 ECC RDIMM Memory Upgrade for Mac Pro (2019)

SKU CH-JF3H-3RMTB

Eight 32 GB DDR4 2666 ECC registered RDIMMs totalling 256 GB for the 2019 Mac Pro

  • Total capacity256 GB (8 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Compatible systemsApple Mac Systems
  • 256GB total capacity from eight 32GB modules
  • DDR4 2666 speed with PC4-21300 bandwidth rating
  • ECC registered design detects and corrects data errors
  • 288-pin RDIMM form factor fits Mac Pro (2019) slots
  • Validated for MacPro7,1 and A2304/A1991 model identifiers

256GB DDR4 2666 ECC RDIMM Kit

This kit provides 256GB of DDR4 2666 memory across eight 32GB registered DIMMs. It is built for the 2019 Mac Pro tower and rack models using the MacPro7,1 identifier. The modules run at 1.20V and carry ECC registered functionality for error correction. Professionals expanding memory on these specific workstations will find the capacity and form factor match the factory slots.

Eight-Module Population

Supplying eight 32GB sticks fills all available DIMM slots in the supported Mac Pro configurations. This removes the need to mix module sizes or leave slots empty, letting the memory controller operate in its optimal channel arrangement. The 2Rx4 rank organisation and PC4-21300 rating are factory-matched to the 3.5GHz Xeon W-3223 processor used in the 8-core model.

Registered 288-Pin Build

Each module uses a 288-pin RDIMM form factor with major-brand chips, ensuring mechanical compatibility with the Mac Pro memory tray. Registered buffering reduces electrical load on the memory bus when all eight slots are populated. The kit carries Apple model IDs A1991 and A2304 along with EMC numbers 3203 and 3413 for direct cross-reference. Systems requiring unbuffered UDIMMs or non-ECC memory cannot use this kit.

How it compares

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

Price $995.99
Pricier than about 61% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (8 × 32 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $3.89 per GB
Cheaper than about 85% 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 capacity256 GB (8 × 32 GB)
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor Brand Chipset
Memory
ECC supportYes
Buffer typeRegistered
Power
Rated voltage1.2 V
Compatibility
Compatible systemsApple Mac Systems

Questions about this item

Will the 288-pin RDIMM modules need any firmware updates or periodic reseating after installation?

No firmware updates or scheduled reseating are required; the DDR4 2666 ECC registered modules are validated for the Mac Pro 7,1 and run at 1.20 V for the life of the system.

What is the first limit reached when all eight 32 GB modules run at 2666 MHz under continuous heavy workloads?

The memory controller on the 3.5 GHz Xeon W-3223 caps the kit at 2666 MHz, so sustained throughput cannot exceed the PC4-21300 rating.

How much extra heat and fan noise does the 256 GB kit add when the Mac Pro runs all day?

Each module operates at the standard 1.20 V DDR4 voltage, so thermal output and acoustic profile remain within the Mac Pro's original cooling design.

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