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Two green DDR5 RDIMM modules with gold contacts and black chips, no heat spreader

OWC

OWC 256GB (2x128GB) DDR5 4800 CL40 4Rx4 1.1V ECC Registered RDIMM memory upgrade

SKU CH-F8X6-JVAAY

A 256GB DDR5 4800 CL40 ECC registered RDIMM kit of two 128GB modules for HP ProLiant Gen11 servers

  • Capacity256GB (2 x 128GB)
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 4800 (PC5 38400)
  • CAS LatencyCL40
  • Voltage1.1V
  • ECCYes

Capacity 256GB (2 x 128GB)

  • ECC registered design protects data integrity in critical server workloads
  • 256GB kit with two 128GB modules expands memory capacity for demanding applications
  • DDR5 4800 CL40 at 1.1V delivers JEDEC-standard performance for compatible HP ProLiant Gen11 servers
  • 4Rx4 registered DIMMs optimise signal integrity in multi-module server configurations
  • 288-pin RDIMM form factor ensures direct compatibility with DL385 DL560 DX360 DX365 ML350 Gen11 platforms

OWC 256GB DDR5 ECC Registered Kit

This kit supplies 256GB of DDR5 ECC registered memory as two 128GB modules. It is built for HP ProLiant Gen11 servers including the DL385, DL560, DX360, DX365 and ML350. The modules will not work in standard desktop computers or in systems that require unbuffered or load-reduced DIMMs.

DDR5 4800 JEDEC Standard Limits

The memory operates at the JEDEC DDR5 4800 standard with a CAS latency of CL40 and 1.1V voltage. Registered DIMMs add a clock cycle of buffering, so maximum usable capacity depends on the server memory controller and populated slot count. Mixing with unbuffered or load-reduced modules is not supported by the platform.

4Rx4 Organisation Decides Fit

Each 128GB module uses a 4Rx4 organisation, which determines electrical loading per channel. The server memory subsystem must support this rank configuration at the target speed; otherwise the system will downclock or fail to post. Verify the HP ProLiant Gen11 memory population rules for 4Rx4 DIMMs before purchase.

Highlights

  • ECC registered design protects data integrity in critical server workloads
  • 256GB kit with two 128GB modules expands memory capacity for demanding applications
  • DDR5 4800 CL40 at 1.1V delivers JEDEC-standard performance for compatible HP ProLiant Gen11 servers
  • 4Rx4 registered DIMMs optimise signal integrity in multi-module server configurations
  • 288-pin RDIMM form factor ensures direct compatibility with DL385 DL560 DX360 DX365 ML350 Gen11 platforms

Specifications

BrandOWC
Part Number4R8D54R4256P
Capacity256GB (2 x 128GB)
Type288-Pin DDR5 ECC RDIMM
SpeedDDR5 4800 (PC5 38400)
CAS LatencyCL40
Voltage1.1V
ECCYes
Buffered/RegisteredRegistered
Rank4Rx4
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

Should I choose this 256 GB kit or a single 128 GB module?

The kit provides two matched 128 GB modules for 256 GB total, enabling dual-channel operation on supported HP ProLiant Gen11 servers; a single module would halve capacity and bandwidth.

What does DDR5 4800 CL40 deliver in an actual server?

The modules run at 4800 MT/s with CAS latency 40 at 1.1 V, giving the rated PC5-38400 throughput when installed in compatible HP ProLiant Gen11 systems.

How does the 288-pin ECC registered RDIMM interface limit use?

The 288-pin registered DIMM with ECC and 4Rx4 organisation fits only DDR5 server platforms that support registered memory; it will not work in unbuffered or consumer boards.

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