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Green circuit board with black memory chips and gold edge connectors

A-Tech

A-Tech 64GB DDR4 2666 ECC LRDIMM 4Rx4 CL19 Server RAM

SKU CH-35MV-DXRNZ

A 64GB DDR4 2666 ECC LRDIMM module with CL19 latency and 1.2V operation for server upgrades

  • Total capacity64 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • 64GB capacity lets servers handle heavier workloads
  • DDR4 2666 speed delivers high data throughput
  • ECC LRDIMM design corrects errors and reduces electrical load
  • CL19 latency at 1.2V balances responsiveness with efficiency
  • 288-pin DIMM fits compatible HP server platforms

Server-grade 64GB DDR4 LRDIMM

This 64GB DDR4 2666MHz ECC LRDIMM module is built for servers and workstations that require registered, load-reduced memory. It operates at PC4-21300 speed with CL19 latency and 1.20V voltage. The 4Rx4 organisation and major-brand chipset target enterprise platforms needing high-capacity, error-correcting DIMMs.

Thermals and power in typical operation

Running at standard DDR4 1.20V, the module draws nominal power for a 64GB load-reduced DIMM at 2666MHz. ECC circuitry adds minimal overhead while maintaining signal integrity under sustained workloads. Passive cooling via system airflow is sufficient; no active cooling or special thermal management is required.

What the compatibility list changes

The module is validated as a direct replacement for ten HP part numbers including 840759-191, 838085-K21 and 881901-B21. This cross-reference lets administrators confirm fitment without trial installation. No additional software, firmware or accessories are bundled; the benefit is assured mechanical and electrical compatibility with the listed HP server models.

How it compares

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

Price $222.99
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 $3.48 per GB
Cheaper than about 86% 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

How do I install the 288-pin DDR4 LRDIMM, and what step is often missed?

Power off the server, open the chassis, align the notch on the 288-pin module with the slot key, press firmly until both ejector tabs click shut, then confirm in BIOS that the 64 GB module is detected at 2666 MHz with ECC active.

What maintenance or replacement will this 64 GB DDR4 ECC LRDIMM need over its service life?

No scheduled maintenance is required; if a correctable error count rises or the module fails POST, replace the single 64 GB stick — matching DDR4 2666 CL19 1.20 V 4Rx4 LRDIMM spec — to restore full capacity.

What limit appears first when this 4Rx4 LRDIMM runs sustained workloads at 2666 MHz?

The four-rank electrical load per channel caps how many modules the memory controller can drive at 2666 MHz; populate slots per the server vendor guide to avoid down-clocking or reduced channel count.

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