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Green rectangular circuit board with black memory chips on both sides, gold edge connectors, no heat spreader

SK hynix

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

SKU CH-D9Q4-R8JDK MPN HMAA8GL7AMR4N-VK

A 64 GB DDR4-2666 ECC load-reduced DIMM that fits 288-pin server slots, runs at CL19 and 1.20 V, and allows more modules per channel than standard registered memory

  • Total capacity64 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • 64GB capacity powers virtualization and in-memory databases
  • Load Reduced design removes channel ranking limits for higher DIMM density
  • ECC protection corrects single-bit errors to maintain data integrity
  • DDR4-2666 speed at 1.20V delivers bandwidth with lower power
  • 4Rx4 organization on 288-pin module maximizes rank efficiency

64 GB DDR4-2666 LRDIMM for Servers

This SK hynix module delivers 64 GB of DDR4-2666 ECC memory in a 288-pin load-reduced form factor. It operates at 1.20 V with a CAS latency of 19 and uses a 4Rx4 rank configuration. The design removes channel ranking limits found on standard RDIMMs, allowing more DIMMs per channel for higher density.

Suited for Virtualisation and In-Memory Databases

It targets administrators expanding memory capacity on dual-socket blade servers that support load-reduced DIMMs. Workloads such as virtualisation, cloud computing and large in-memory databases benefit from the added bandwidth and density. Buyers with standard desktop motherboards or systems that only accept unbuffered ECC UDIMMs cannot use this module.

Installation Notes for Qualified Platforms

Installation follows the standard 288-pin DIMM procedure on compatible server boards, but the module must only be paired with other load-reduced DIMMs. Mixing with registered or unbuffered ECC types will prevent the system from posting. Verify the server’s qualified-vendor list and populate slots per the manufacturer’s channel guidelines to avoid training failures.

How it compares

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

Price $238.99
Pricier than about 55% 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 $3.73 per GB
Cheaper than about 84% 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

Does my motherboard need DDR4 slots and ECC Load Reduced DIMM support to use this 64GB module?

Yes, the module is a 288‑Pin DDR4 SDRAM running at 2666 MT/s with CL19 latency at 1.20 V; the board must accept DDR4 ECC Load Reduced DIMMs and provide registered‑memory signalling.

Can I keep my existing standard RDIMMs in the same server when adding this LRDIMM?

No, ECC Registered DIMMs and ECC Load Reduced DIMMs cannot be mixed; all existing RDIMMs must be removed before installing this 4Rx4 module.

How do I confirm the module is running at its rated 2666 MT/s speed after installation?

Check the BIOS or OS memory report — it should show DDR4‑2666 (PC4‑21300), CL19 timings, 1.20 V operation and the full 64 GB capacity per module.

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