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SK hynix

SK hynix HMCG94AHBRA 64GB DDR5-6400MT/s 2Rx4 Registered DIMM server RAM

SKU CH-W37A-KJW9B MPN HMCG94AHBRA

64 GB DDR5 server memory running at 6400 MT/s with registered 2Rx4 organisation and 1.1 V operation

  • 64 GB capacity handles large server workloads
  • DDR5 6400 MT/s speed moves data quickly
  • Registered DIMM design improves signal integrity
  • Dual-rank 2Rx4 organisation increases memory density
  • Low 1.1 V voltage reduces power draw

Capacity and Speed

This SK hynix HMCG94AHBRA module provides 64GB of DDR5 server memory operating at 6400 MT/s. The dual-rank 2Rx4 organisation and 1.1V voltage suit registered DIMM slots in enterprise platforms. It is built for workloads that demand high density and sustained throughput.

Suited for Registered DIMM Servers

This part fits systems that accept 288-pin registered DDR5 DIMMs with ECC. It is not for consumer desktops or laptops that require unbuffered SO-DIMMs or non-ECC UDIMMs. Buyers needing lower capacities or different form factors should look elsewhere.

Deciding Specification: Registered DDR5 6400 MT/s

The 6400 MT/s PC5-51200 registered DDR5 rating determines whether this module matches the server memory controller and platform qualification list. Verify that the motherboard supports registered DDR5 at this speed and 1.1V before purchasing.

How it compares

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

Price $4,893.99
Pricier than about 90% of the 6,523 comparable items (median $188.99).

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

Specifications

No published specifications for this item yet.

Questions about this item

Will the dual-rank 2Rx4 organisation require any specific slot population rules when I add more modules later?

The module is a 2Rx4 registered DIMM, so the platform's memory controller and BIOS determine the allowed slot order and maximum rank count per channel. Check the server or motherboard manual for the exact population sequence before expanding.

What thermal or electrical limit appears first when the DIMM runs continuously at 6400 MT/s?

The JEDEC-rated 1.1 V operating voltage and the DDR5-6400 speed grade define the thermal-design-power envelope; sustained full-load operation will hit the controller's thermal-throttling point before the module exceeds its specified voltage margin.

How much additional noise and heat does a bank of these registered DIMMs contribute when the server runs all day?

Registered DDR5 DIMMs have no moving parts; they add only the heat from 1.1 V operation at 6400 MT/s, which the system's existing airflow handles without increasing fan speed or audible noise.

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