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Four green DDR4 LRDIMM modules with gold contacts and black heat spreaders

A-Tech

A-Tech 256GB Kit (4x64GB) DDR4 2666 ECC LRDIMM 288-Pin Memory Upgrade

SKU CH-47YN-AGTFV

256GB DDR4 2666 ECC LRDIMM kit with four 64GB modules for 2019 Mac Pro

  • Capacity256GB (4 x 64GB)
  • SpeedDDR4 2666 (PC4 21300)
  • Voltage1.20V
  • ECCYes
  • Buffered/RegisteredLoad Reduced
  • ChipsetMajor Brand Chipset
  • 256 GB total capacity from four 64 GB modules for heavy workloads
  • DDR4 2666 MHz speed rated at PC4-21300 for fast data transfer
  • ECC Load Reduced design detects and corrects memory errors
  • 288-pin LRDIMM form factor built for Apple Mac Pro 2019 systems
  • Major-brand chips tested to strict quality standards for reliable operation

Mac Pro 2019 memory kit

This 256GB kit contains four 64GB DDR4 2666 ECC LRDIMM modules built for the Apple Mac Pro (2019, 8-Core) in both rack and tower configurations. It targets professionals who need maximum supported memory for heavy multitasking and large datasets on these specific workstations.

Installation and common issues

The modules use a 288-pin LRDIMM form factor that seats vertically in the Mac Pro memory bays; installation requires opening the enclosure and pressing each module firmly until the ejectors click. The most common issue is mixing these load-reduced ECC modules with standard RDIMM or UDIMM types, which prevents the system from booting.

DDR4 2666 ECC LRDIMM limits

The DDR4 2666 interface caps bandwidth at the PC4-21300 rate, so workloads that scale with memory throughput will hit that ceiling regardless of capacity. ECC and load-reduced buffering add latency overhead compared with unbuffered non-ECC memory, which can slightly reduce single-thread responsiveness in latency-sensitive tasks.

Highlights

  • 256 GB total capacity from four 64 GB modules for heavy workloads
  • DDR4 2666 MHz speed rated at PC4-21300 for fast data transfer
  • ECC Load Reduced design detects and corrects memory errors
  • 288-pin LRDIMM form factor built for Apple Mac Pro 2019 systems
  • Major-brand chips tested to strict quality standards for reliable operation

Specifications

BrandA-Tech
SeriesA-Tech DDR4 Apple Mac RAM Memory Upgrades
Capacity256GB (4 x 64GB)
SpeedDDR4 2666 (PC4 21300)
Voltage1.20V
ECCYes
Buffered/RegisteredLoad Reduced
ChipsetMajor Brand Chipset
Compatible SystemApple Mac Systems
FeaturesMajor Brand Chips

Questions about this item

How can I verify the 256GB kit is running at 2666 MHz with ECC active after installation?

Open System Report on the Mac Pro (2019, 8-Core) and confirm each of the four 64GB modules shows DDR4 2666/2667 MHz, PC4-21300, ECC LRDIMM, 288-Pin, and 1.20V operation.

What comes in the box and what must be purchased separately for this upgrade?

The box contains four 64GB DDR4 2666 ECC LRDIMM 288-Pin modules; no cables, tools, or additional memory are required for a compatible Mac Pro (2019) installation.

Which capacity option should I choose for a Mac Pro 7,1 with a 3.5GHz Xeon W-3223 processor?

Select the 256GB kit (4 x 64GB) — it matches the Apple order numbers BTO/CTO, model IDs MacPro7,1, and model numbers A2304 (EMC 3413) / A1991 (EMC 3203).

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