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Green rectangular DDR5 memory module with gold contacts and black chips, no heat spreader

OWC

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

SKU CH-RMPD-GMY3Z

A 128 GB DDR5 ECC registered RDIMM running at 4800 MHz CL40 for HP ProLiant DL320 Gen11, DL380a Gen11 and DX320 Gen11 servers

  • Capacity128GB
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 4800 (PC5 38400)
  • CAS LatencyCL40
  • Voltage1.1V
  • ECCYes

Capacity 128GB

  • 128 GB capacity expands server memory headroom for demanding workloads
  • DDR5 4800 speed delivers high bandwidth for data-intensive applications
  • CL40 latency with 1.1 V operation balances responsiveness and efficiency
  • ECC registered design protects data integrity in mission-critical environments
  • Validated for HP ProLiant DL320 Gen11 DL380a Gen11 DX320 Gen11

Server ECC DDR5 upgrade

This 128GB DDR5 registered DIMM is built for HP ProLiant DL320 Gen11, DL380a Gen11 and DX320 Gen11 servers. It delivers error-correcting memory for workloads that cannot tolerate data corruption. The module is not compatible with standard desktop computers or consumer motherboards. Buyers who need unbuffered or load-reduced memory for other platforms must choose a different product.

DDR5 4800 registered limits

The stick runs at DDR5 4800 with CL40 latency and 1.1V operation under JEDEC PC5-38400 specification. Registered buffering adds one cycle of address-command delay, which is mandatory for the supported ProLiant platforms. Mixing this module with unbuffered or load-reduced DIMMs will prevent the system from booting. Capacity beyond 128GB per slot requires higher-density parts not covered by this part number.

Single-rank 4Rx4 build

A 4Rx4 organisation packs the full 128GB into one 288-pin module without a heat spreader, leaving the DRAM exposed for direct airflow in dense server chassis. The registered interface and ECC function are handled by the onboard register and parity logic, so no extra cables or configuration steps are needed. Installers simply seat the DIMM in a compatible slot and the firmware recognises it automatically.

Highlights

  • 128 GB capacity expands server memory headroom for demanding workloads
  • DDR5 4800 speed delivers high bandwidth for data-intensive applications
  • CL40 latency with 1.1 V operation balances responsiveness and efficiency
  • ECC registered design protects data integrity in mission-critical environments
  • Validated for HP ProLiant DL320 Gen11 DL380a Gen11 DX320 Gen11

Specifications

BrandOWC
Part Number4R8D54R4128G
Capacity128GB
Type288-Pin DDR5 ECC RDIMM
SpeedDDR5 4800 (PC5 38400)
CAS LatencyCL40
Voltage1.1V
ECCYes
Buffered/RegisteredRegistered
Rank4Rx4
Heat SpreaderNo
Compatible SystemHP ProLiant DL320 Gen11
HP ProLiant DL380a Gen11
HP ProLiant DX320 Gen11

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Questions about this item

Should I pick the 128 GB module or combine smaller sticks to reach the same total?

This single 128 GB DDR5 4800 CL40 4Rx4 registered DIMM fills one slot; using it leaves more empty slots for future expansion than populating multiple smaller modules would.

What does the 4800 MT/s rating deliver inside an HP ProLiant DL320 Gen11?

The module runs at DDR5 4800 with CL40 latency at 1.1 V, providing the maximum JEDEC-standard throughput the Gen11 memory controller supports for a 4Rx4 registered DIMM.

How does the 288-pin DDR5 ECC registered interface limit real-world bandwidth?

The 288-pin registered ECC interface caps transfer rate at PC5-38400 (4800 MT/s) and requires a server chipset that supports registered DDR5; it will not work in unbuffered or consumer platforms.

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