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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

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank4Rx4

Capacity 256GB (2 x 128GB)

Show 4 more

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.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $7,762.99
Pricier than about 91% of the 6,523 comparable items (median $188.99).
Total capacity 256 GB (2 × 128 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $30.32 per GB
Pricier than about 90% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number4R8D54R4256P
Total capacity256 GB (2 × 128 GB)
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Memory rank4Rx4
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.1 V

Other versions of this model

5 more in the same range

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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