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Green 288-pin DDR4 LR-DIMM module with black memory chips

SAMSUNG

SAMSUNG M386A8K40CM2-CTD 64GB DDR4-2666 ECC LR-DIMM 4Rx4

SKU CH-H1TN-3TMNG

64 GB DDR4-2666 ECC load-reduced DIMM with quad-rank x4 organisation for high-density server memory

  • Total capacity64 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • Memory rank4Rx4
  • 64 GB capacity supports data-intensive workloads
  • Load Reduced design enables four ranks per module
  • ECC protection corrects single-bit errors automatically
  • DDR4-2666 speed delivers 21300 MB/s bandwidth
  • 20 V operation reduces server power draw

64GB DDR4-2666 ECC LR-DIMM module

This 64GB DDR4-2666 ECC Load Reduced DIMM is built for servers and workstations that need maximum memory capacity per slot. The LR-DIMM buffer replaces a standard register, allowing four ranks on a single 288-pin module so dense configurations reach higher totals without extra DIMM slots.

Buffer chip enables quad-rank density

The on-module buffer chip manages electrical loading so four ranks of x4 chips operate reliably at 2666 MT/s and CL19 latency. This design lets the module deliver 64GB at 1.20V while keeping signal integrity intact, which is critical for data-intensive workloads in cloud and high-performance computing environments.

Verify LR-DIMM support before ordering

Not all platforms accept Load Reduced DIMMs, and they cannot be mixed with RDIMM, ECC UDIMM or standard UDIMM modules. Check your system documentation or motherboard qualified-vendor list to confirm LR-DIMM compatibility and the maximum supported capacity per channel.

How it compares

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

Price $220.99
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 $3.45 per GB
Cheaper than about 86% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameSAMSUNG
Total capacity64 GB
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor Brand Chipset
Memory
ECC supportYes
Buffer typeLoad Reduced
Memory rank4Rx4
Power
Rated voltage1.2 V

Questions about this item

Does the 4Rx4 quad-rank layout mean I will need to replace the module sooner than a dual-rank stick?

The 4Rx4 organisation fits more capacity into one slot, so you can reach 64 GB without populating every channel; it does not shorten the module's own service life.

What is the first limit reached when the LR-DIMM runs at 2666 MHz continuously?

The memory controller's maximum supported rank count per channel is usually reached before the module hits thermal or bandwidth limits.

How much heat does the 1.20 V LR-DIMM produce when it runs all day in a server?

At 1.20 V the module draws less power than earlier DDR4 voltages, and the load-reduced buffer spreads electrical load across ranks, keeping thermals manageable in normal airflow.

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