Specifications
Part Number
HMCT04MHBRC
Capacity
128 GB
Speed
DDR5-6400 MT/s (PC5-51200)
DIMM Type
ECC Registered (RDIMM)
Rank & Organization
2Rx4 — dual rank, x4
Chip Organization
x4
CAS Latency
CL52
Voltage
1.1 V
Pins
288-pin
Module Height
STD
JEDEC Spec
PC5-51200R
Temperature Range
0 °C to 95 °C
ECC
Yes
PMIC
On-module PMIC (DDR5)
Lead Time
Four to five days (distributor)
Overview
The SK hynix HMCT04MHBRC is a 128 GB DDR5-6400 ECC Registered DIMM in a 2Rx4 dual-rank x4 organisation with CL52 latency and a 0-95 °C operating window. It is the SK hynix counterpart to the Micron and Samsung 128 GB DDR5-6400 modules and competes on the same density and speed tier.
SK hynix is the largest HBM supplier and its RDIMM line shares die-level technology with that business, so module availability tends to track HBM demand cycles. For a buyer assembling 1 TB-per-socket nodes, the practical question is usually which of the three vendors can ship the full DIMM count from a single lot - mixing vendors across channels within a socket is a validated-but-undesirable configuration.
The 95 °C ceiling is worth noting for high-density liquid-cooled or rear-door-heat-exchanger deployments where DIMM ambient runs hotter than in a standard front-to-back air chassis.
Key Benefits
128 GB 2Rx4 — 1 TB per socket at eight DIMMs. DDR5-6400 CL52 — current-generation 1-DPC speed tier. 95 °C operating ceiling — headroom for dense or liquid-cooled chassis. Registered ECC — full-rank error-corrected operation.
Applications
AI inference hosts, in-memory and columnar databases, cloud and virtualisation fleets, real-time analytics, and high-density HPC nodes.
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