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Green rectangular circuit board with gold edge connector and black memory chips, no heat spreader

SK hynix

SK hynix HMAA8GL7AMR4N-VK 64GB DDR4-2666 ECC Load Reduced server RAM

SKU CH-RH40-3D2WW MPN HMAA8GL7AMR4N-VK

A 64 GB DDR4-2666 ECC Load Reduced DIMM that lets you install more modules per channel for higher memory density

  • Total capacity64 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • 64 GB capacity supports large-scale virtualization and in-memory databases
  • Load Reduced design removes channel ranking limits for higher DIMM density
  • ECC protection detects and corrects single-bit errors to safeguard data integrity
  • DDR4 2666 speed delivers 21300 MB/s bandwidth for demanding workloads
  • 20 V operation reduces power draw compared to standard registered modules

64GB DDR4-2666 LRDIMM for Servers

This 64GB DDR4-2666 Load Reduced DIMM targets administrators expanding memory in compatible servers and Supermicro SuperWorkstations. The ECC LRDIMM design removes channel ranking limits found in standard RDIMMs, allowing more modules per channel for higher total capacity. It suits virtualization, HPC and in-memory database workloads needing maximum density per slot.

Verify ECC Registered Compatibility

Confirm the platform accepts DDR4 ECC Load Reduced modules before ordering, as ECC Registered and ECC Unbuffered DIMMs cannot be mixed in the same system. If the machine currently uses UDIMMs, all existing modules must be removed prior to installation. Check the motherboard manual for supported speeds, ranks and maximum capacity per channel to ensure correct operation.

No Heat Spreader Included

The module ships without a heat spreader, relying on server chassis airflow for thermal management. Ensure the target system provides adequate directed cooling across the DIMM slots. Manufacturer highlights include a lifetime warranty on the memory itself, though warranty service is handled by the shop rather than the product specification.

How it compares

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

Price $250.99
Pricier than about 56% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $3.92 per GB
Cheaper than about 82% of the 6,064 comparable items (median $7.25 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameSK hynix
Model nameHMAA8GL7AMR4N-VK
Total capacity64 GB
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL19
ECC supportYes
Buffer typeLoad Reduced
Memory rank4Rx4
Heat spreaderNo
Power
Rated voltage1.2 V

Questions about this item

What comes in the box and what must I buy separately?

The module is a single 64GB DDR4-2666 ECC Load Reduced DIMM; no heat spreader, cables or additional parts are included.

Which capacity or version should I choose for my server?

This part is a 64GB 4Rx4 Load Reduced DIMM running at 2666 MT/s CL19; select it when your platform requires LRDIMMs to exceed standard RDIMM density limits per channel.

What does the 2666 MT/s rating mean once the DIMM is installed?

The memory transfers data at 2666 million transfers per second (PC4-21300 bandwidth) with CL19 latency at 1.20 V, provided the server CPU and chipset support DDR4-2666 LRDIMMs.

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