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Four green 288-pin DDR5 RDIMM modules in antistatic tray

OWC

OWC 256GB (4x64GB) DDR5 4800 CL40 2Rx4 ECC RDIMM Kit for HP ProLiant Gen11

SKU CH-H9QG-RS9FF

ECC registered DDR5 kit adds 256 GB across four 64 GB modules at 4800 MT/s CL40 for HP ProLiant Gen11 servers

  • Capacity256GB (4 x 64GB)
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 4800 (PC5 38400)
  • CAS LatencyCL40
  • Voltage1.1V
  • ECCYes

Capacity 256GB (4 x 64GB)

  • 256 GB total capacity from four 64 GB modules
  • DDR5 4800 speed with CL40 latency for server workloads
  • ECC registered design protects data integrity in critical systems
  • 1 V operation reduces power draw in dense configurations
  • Validated for HP ProLiant Gen11 DL385, DL560, DX360, DX365 and ML350

Server memory kit for HP ProLiant Gen11

This OWC kit supplies 256GB of DDR5 ECC registered memory across four 64GB modules. It targets administrators upgrading HP ProLiant DL385 Gen11 DL560 Gen11 DX360 Gen11 DX365 Gen11 and ML350 Gen11 servers. The modules are not compatible with standard desktop computers and cannot be mixed with unbuffered or load reduced memory.

Build quality and daily handling

Each module uses a 288-pin DDR5 RDIMM form factor without a heat spreader operating at 1.1V. JEDEC-standard and RoHS compliant construction meets OEM specifications for warranty safe installation. The registered design adds a buffer that stabilises heavy memory populations in multi-socket server boards.

Practical limits of the DDR5 4800 interface

The kit runs at DDR5 4800 PC5-38400 with CL40 latency in a 2Rx4 organisation. Bandwidth and latency are fixed by this JEDEC speed grade so workloads needing higher throughput or lower latency will not benefit from this module set. Capacity is capped at the 256GB provided by the four modules.

Highlights

  • 256 GB total capacity from four 64 GB modules
  • DDR5 4800 speed with CL40 latency for server workloads
  • ECC registered design protects data integrity in critical systems
  • 1 V operation reduces power draw in dense configurations
  • Validated for HP ProLiant Gen11 DL385, DL560, DX360, DX365 and ML350

Specifications

BrandOWC
Part Number4R8D52R4256S
Capacity256GB (4 x 64GB)
Type288-Pin DDR5 ECC RDIMM
SpeedDDR5 4800 (PC5 38400)
CAS LatencyCL40
Voltage1.1V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Heat SpreaderNo
Compatible SystemHP ProLiant DL385 Gen11
HP ProLiant DL560 Gen11
HP ProLiant DX360 Gen11
HP ProLiant DX365 Gen11
HP ProLiant ML350 Gen11

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Questions about this item

Does the DDR5 4800 PC5-38400 interface cap practical throughput at the rated transfer rate?

The kit runs at DDR5 4800 with a PC5-38400 data rate, so each module transfers at up to 4800 MT/s under JEDEC-standard timings.

What physical slot and clearance do the 288-pin RDIMMs require in the ProLiant Gen11 servers?

Each module is a 288-pin DDR5 ECC Registered DIMM; they install in the standard RDIMM slots on the DL385, DL560, DX360, DX365 and ML350 Gen11 motherboards.

What is the correct population order for the four 2Rx4 modules, and which step is often missed?

Populate all four 64GB 2Rx4 modules in the channel order shown in the server's memory guide, then verify the BIOS reports 256GB at 4800 MT/s with ECC active.

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