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Green rectangular DDR5 server memory module with gold contacts and black chips on both sides, no heat spreader

OWC

OWC 4R8D54R4128G 128GB DDR5 4800 CL40 4Rx4 288-pin 1.1V ECC Registered RDIMM server RAM

SKU CH-6B9J-DY5SF

128GB DDR5 4800 ECC registered RDIMM for server and workstation upgrades

  • Capacity128GB
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 4800 (PC5 38400)
  • CAS LatencyCL40
  • Voltage1.1V
  • ECCYes
  • 128 GB capacity enables large-scale virtualization and in-memory workloads
  • DDR5 4800 speed delivers high bandwidth for data-intensive server tasks
  • ECC registered design detects and corrects errors to protect critical data integrity
  • JEDEC and RoHS compliant for warranty-safe deployment in OEM systems
  • 1 V operation reduces power draw per module in dense configurations

Server Memory Upgrade

This 128GB DDR5 4800 ECC Registered RDIMM is built for workstations and servers that require error-correcting registered memory. It operates at 1.1V with CL40 latency and a 4Rx4 rank configuration across 288 pins. The module replaces Hynix parts HMCT04MEERA129N, HMCT04MEERA131N, HMCT04MEERA133N and HMCT04MEERA135N.

DDR5 4800 Interface Limits

The DDR5 4800 standard provides a PC5-38400 data rate that cannot be exceeded without platform support for higher JEDEC speeds. Registered DIMMs add a clock cycle of buffering that desktop consumer boards do not expect. Mixing this module with unbuffered or load-reduced ECC memory is not supported by the memory controller.

Replacing Older Registered DIMMs

This module upgrades systems currently running lower-capacity or slower registered ECC DDR5 DIMMs where the platform qualifies 128GB 4Rx4 parts at 4800 MT/s. The jump is worth it when the workload demands maximum registered memory density per slot and the server or workstation vendor lists these Hynix part numbers as compatible.

Highlights

  • 128 GB capacity enables large-scale virtualization and in-memory workloads
  • DDR5 4800 speed delivers high bandwidth for data-intensive server tasks
  • ECC registered design detects and corrects errors to protect critical data integrity
  • JEDEC and RoHS compliant for warranty-safe deployment in OEM systems
  • 1 V operation reduces power draw per module in dense configurations

Specifications

BrandOWC
Part Number4R8D54R4128G
Capacity128GB
Type288-Pin DDR5 ECC RDIMM
SpeedDDR5 4800 (PC5 38400)
CAS LatencyCL40
Voltage1.1V
ECCYes
Buffered/RegisteredRegistered
Rank4Rx4
Heat SpreaderNo

Questions about this item

How do I know if this 128GB DDR5 4800 CL40 4Rx4 RDIMM is the right capacity and rank for my server?

Choose this 128GB 4Rx4 module when your platform requires a single high-density registered DIMM at DDR5 4800 with CL40 latency and 1.1V operation.

What does the DDR5 4800 PC5-38400 rating deliver once the module is installed in a compatible server?

The module runs at 4800 MT/s, providing a peak bandwidth of 38400 MB/s per DIMM with CL40 timing and ECC error correction active.

How does the 288-pin DDR5 registered ECC interface limit real-world use in my system?

The 288-pin RDIMM form factor fits only DDR5 server and workstation boards that support registered ECC memory; it cannot be used in unbuffered or consumer platforms.

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