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Green 288-pin DDR4 LRDIMM module with black chips and silver label

A-Tech

A-Tech 64GB DDR4 2666 ECC LRDIMM 4Rx4 Server Memory

SKU CH-BX85-CZMKT

64 GB DDR4 2666 ECC load-reduced DIMM with 4Rx4 organisation and 1.2 V operation for server workloads

  • Total capacity64 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • 64 GB capacity lets servers handle heavy workloads
  • DDR4 2666 speed moves data at PC4-21300 rates
  • ECC Load Reduced design protects data integrity in critical tasks
  • 4Rx4 rank structure fits high-density memory slots
  • 2 V operation matches standard DDR4 voltage requirements

High-capacity server memory

This 64GB DDR4 module delivers 2666MHz speed with ECC LRDIMM technology for server and workstation systems. The single-module design uses a 4Rx4 rank configuration and operates at standard 1.20V voltage. It serves as a direct replacement for specific Samsung part numbers including M386A8K40BM2-CTD, M386A8K40CM2-CTD, and M386A8K40DM2-CTD.

DDR4 2666 interface limits

The PC4-21300 standard caps transfer rates at 2666MHz with CL19 latency, which defines the practical bandwidth ceiling for this memory. Load-reduced architecture helps maintain signal integrity at this density, but the DDR4 interface itself cannot exceed the JEDEC-specified frequency without platform support for higher speeds. Systems limited to lower DDR4 speeds will downclock the module automatically.

288-pin LRDIMM build quality

The 288-pin DIMM form factor fits standard DDR4 server slots, while the load-reduced design reduces electrical load on the memory controller for stable operation at 64GB capacity. Major brand chips undergo quality assurance testing for dependable performance in multi-module configurations. The 4Rx4 organization requires compatible motherboard support for quad-rank modules to function correctly.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $225.99
Typical for this category: the median of 6,523 items is $188.99.
Total capacity 64 GB
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $3.53 per GB
Cheaper than about 85% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameA-Tech
Total capacity64 GB
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL19
ECC supportYes
Buffer typeLoad Reduced
Memory rank4Rx4
Power
Rated voltage1.2 V

Questions about this item

Should I pick the 64GB module or combine smaller sticks to reach 64GB?

This listing is a single 64GB LRDIMM so you install one module per slot; adding smaller sticks would mix ranks and can prevent the server from booting.

What does the 2666MHz rating actually deliver in a live server?

The module runs at DDR4 2666 MT/s (PC4-21300) with CL19 latency at 1.20V, giving the rated bandwidth only when the platform's memory controller supports that speed.

How does the LRDIMM interface affect maximum capacity per channel?

Load Reduced DIMM buffering lowers electrical load on the memory bus, letting the server populate more slots per channel than standard RDIMMs and reach higher total capacity.

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