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Two green 288-pin DDR5 RDIMM modules without heat spreaders

OWC

OWC 256GB (2x128GB) DDR5 4800 CL40 4Rx4 ECC Registered RDIMM Server RAM

SKU CH-F055-EG6FW

A dual-channel kit delivering 256 GB of DDR5 4800 ECC registered RDIMM memory for compatible servers and workstations

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

Capacity 256GB (2 x 128GB)

Show 4 more configurations

Rank 4Rx4

  • 256 GB total capacity from two 128 GB modules
  • DDR5 4800 speed rated at PC5-38400 bandwidth
  • CL40 latency at 1.1 V operating voltage
  • ECC registered 4Rx4 design for server error correction
  • JEDEC and ROHS compliant dual-channel kit

Server-grade DDR5 ECC RDIMM kit

This OWC kit provides 256 GB of DDR5 registered ECC memory in a matched pair of 128 GB modules. It is built for workstations and servers that require registered DIMMs with error correction. Standard desktop platforms cannot use this memory. Mixing with unbuffered or load-reduced DIMMs is not supported.

288-pin registered dual-channel layout

Each module uses the 288-pin DDR5 form factor and operates at 1.1 V with a CL40 latency. The registered design adds a buffer that reduces electrical load on the memory controller, which is essential for high-capacity server configurations. No heat spreaders are fitted, so airflow in the chassis must be sufficient for the bare modules.

4800 MT/s JEDEC-standard speed

The kit runs at DDR5 4800 (PC5-38400) with a 4Rx4 organisation, delivering the baseline JEDEC data rate for DDR5 registered memory. This speed is fixed by the module SPD and cannot be increased without platform support for higher JEDEC profiles. Buyers needing faster rated speeds must select modules specified for those higher grades.

Highlights

  • 256 GB total capacity from two 128 GB modules
  • DDR5 4800 speed rated at PC5-38400 bandwidth
  • CL40 latency at 1.1 V operating voltage
  • ECC registered 4Rx4 design for server error correction
  • JEDEC and ROHS compliant dual-channel kit

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
Multi-channel KitDual Channel Kit
Heat SpreaderNo

Other versions of this model

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Questions about this item

Does this DDR5 4800 kit run at the full JEDEC speed or is it capped lower in practice?

The modules operate at DDR5 4800 (PC5-38400) with a CAS latency of CL40, matching the JEDEC standard for this speed grade.

What physical slot and pin count do these modules need?

Each module uses a 288-pin DDR5 RDIMM form factor and requires a registered-DIMM slot on a compatible workstation or server motherboard.

How are the two 128 GB sticks installed for dual-channel operation, and what mistake should be avoided?

Populate one module per memory channel following the motherboard's channel map; do not mix these registered ECC DIMMs with unbuffered or load-reduced memory.

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