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Four green DDR5 RDIMM sticks in static bags

OWC

OWC 512GB (4x128GB) DDR5 4800 CL40 4Rx4 ECC Registered RDIMM server RAM

SKU CH-088C-PHMD9

A 512GB quad-channel DDR5 4800 CL40 registered ECC kit for servers and workstations

  • Total capacity512 GB (4 × 128 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank4Rx4

Capacity 512GB (4 x 128GB)

Show 4 more

Rank 4Rx4

  • 512 GB total capacity across four 128 GB modules
  • DDR5 4800 speed with CL40 latency for server workloads
  • ECC registered RDIMM detects and corrects memory errors
  • 1 V operation reduces power draw in dense configs
  • JEDEC and ROHS compliant for warranty-safe upgrades

Capacity and kit layout

This OWC kit delivers 512GB of DDR5 server memory across four 128GB modules. It is built for workstations and servers that require registered ECC RDIMMs and will not function in standard desktop computers.

Registered ECC with 4Rx4 organisation

Each module uses a 4Rx4 rank structure and registered buffering to support high-density configurations. The kit cannot be mixed with unbuffered or load-reduced ECC memory, so the platform must accept registered RDIMMs exclusively.

DDR5 4800 CL40 at 1.1V

The modules run at DDR5 4800 (PC5-38400) with a CAS latency of 40 and operate at 1.1V. This speed and voltage combination determines whether the memory matches the motherboard's qualified vendor list.

How it compares

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

Price $13,932.99
Pricier than about 92% of the 6,523 comparable items (median $188.99).
Total capacity 512 GB (4 × 128 GB)
Higher than about 91% of the 6,064 comparable items (median 32 GB).
Price per GB $27.21 per GB
Pricier than about 88% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number4R8D54R4512S
Total capacity512 GB (4 × 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

Will the 128 GB 4Rx4 registered modules need any firmware updates or periodic re-seating over time?

No firmware updates or scheduled re-seating are required for these JEDEC-standard 288-pin DDR5 4800 CL40 1.1 V ECC registered DIMMs; they are designed for continuous server operation.

What limit appears first when the 512 GB kit runs at full DDR5 4800 speed under sustained load?

The CL40 latency at 4800 MT/s and the 1.1 V operating voltage define the electrical envelope; thermal limits depend on chassis airflow since the modules have no heat spreaders.

How much power and heat do the four 128 GB sticks produce when the server runs all day?

Each 1.1 V DDR5 4800 registered module draws low power typical for 4Rx4 ECC RDIMMs; total heat scales with all four populated slots, so adequate case airflow is the main cooling consideration.

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