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SK hynix

SK hynix HMABAGR7A4R4N-VN 128GB DDR4-2666 ECC Registered Octal Rank server RAM

SKU CH-QCAK-QGP6T

A 128 GB DDR4-2666 registered ECC module with octal-rank organisation for high-density server memory configurations

  • Total capacity128 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Buffer typeRegistered
  • Product type288-Pin DDR4 SDRAM
  • 128 GB capacity supports large server workloads
  • DDR4-2666 speed delivers 21300 MT/s data rate
  • ECC registered design protects data integrity
  • Octal rank architecture maximises module density
  • 288-pin DDR4 form factor fits standard server slots

128GB DDR4-2666 ECC Registered Server Memory

This 128GB module uses 288-pin DDR4 SDRAM rated at 2666 MT/s with PC4-21300 bandwidth. It targets servers and workstations that require error-correcting code and registered signal buffering for high-density configurations.

Installation notes and common issues

The module plugs into standard 288-pin DDR4 RDIMM slots and is keyed to prevent misalignment. Builders must verify that the platform supports octal-rank registered DIMMs and the CL19 latency profile, otherwise the system may fail to post or cap usable capacity.

Octal rank density constraint

Octal rank organisation allows 128GB in a single stick but increases electrical load on the memory controller. Platforms limited to dual-rank or quad-rank modules cannot use this part, so the rank count is the decisive compatibility filter.

How it compares

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

Price $609.99
Pricier than about 73% of the 6,523 comparable items (median $188.99).
Total capacity 128 GB
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $4.77 per GB
Cheaper than about 75% 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 nameHynix
Part numberHMABAGR7A4R4N-VN
Total capacity128 GB
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered

Questions about this item

How can I confirm the 128GB DDR4-2666 module is running at the correct CL19 latency after installation?

Enter the system BIOS or UEFI and verify the memory frequency reads 2666 MT/s with CAS latency set to 19; the registered ECC design also allows the OS to report corrected error counts, confirming active ECC operation.

What comes with the HMABAGR7A4R4N-VN module and what must I source separately?

The box contains the single 128GB 288-pin DDR4 registered DIMM; you must provide a compatible server or workstation motherboard with DDR4 RDIMM slots and a CPU that supports octal-rank registered memory.

Which capacity and rank version should I choose for a server needing maximum density per slot?

This part is a single 128GB octal-rank DDR4-2666 registered module; choose it when your platform supports octal-rank RDIMMs and you need the highest capacity per 288-pin slot.

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