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Four green DDR4 RDIMM sticks with black chips and silver heat spreaders

A-Tech

A-Tech 128GB Kit (4x32GB) DDR4 2666 ECC RDIMM for Mac Pro 2019

SKU CH-7GRH-7P66P

A 128 GB DDR4 2666 ECC registered kit of four 32 GB modules built for the 2019 Mac Pro tower and rack models

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Compatible systemsApple Mac Systems
  • 128GB total capacity with four 32GB modules for heavy multitasking
  • DDR4 2666/2667 MHz speed rated at PC4-21300 for fast data transfer
  • ECC registered RDIMM design detects and corrects memory errors automatically
  • 288-pin DDR4 form factor built for Mac Pro 2019 tower and rack models
  • 20V low-voltage operation reduces power draw and heat output

A-Tech 128GB DDR4 ECC RDIMM Kit

This 128GB kit contains four 32GB DDR4 2666MHz registered ECC modules built for the Apple Mac Pro 2019. The PC4-21300 RDIMMs operate at 1.20V and use major-brand chips validated for MacPro7,1 systems including the 8-Core tower and rack models with the 3.5GHz Xeon W-3223 processor.

Suited for Mac Pro 2019 owners adding maximum ECC

The kit fits the A2304 and A1991 model numbers and BTO/CTO order codes that accept RDIMM modules. Builders using non-Apple workstations, laptops, or desktop boards that require unbuffered UDIMMs or a different pin count cannot use these registered 288-pin DIMMs.

Registered ECC RDIMM form factor is the deciding

The modules are 288-pin DDR4 RDIMMs with ECC Registered (2Rx4) organisation. Systems that only support unbuffered non-ECC UDIMMs or SO-DIMMs will not accept this memory, so the registered ECC RDIMM format is the single specification that determines compatibility.

How it compares

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

Price $506.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 128 GB (4 × 32 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $3.96 per GB
Cheaper than about 84% 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 capacity128 GB (4 × 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

How many DIMM slots and what pin count does the 2019 Mac Pro require for this 4 x 32 GB RDIMM kit?

The Mac Pro 2019 uses 288-pin DDR4 RDIMM slots; this kit provides four 32 GB modules to fill four slots for a total of 128 GB.

What is the correct seating procedure for these registered ECC modules, and which step do installers often miss?

Align the notch on each 288-pin RDIMM with the slot key, press firmly until both side latches click, then verify all four modules show 32 GB in System Report.

When should the registered ECC memory be re-seated or replaced in a 2019 Mac Pro running a 3.5 GHz Xeon W-3223?

Re-seat if macOS reports memory errors or the system fails POST; replace modules only if diagnostics confirm a persistent fault after re-seating.

More in Model-Specific Memory Upgrades

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