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Four green DDR5 ECC registered DIMMs with gold contacts

OWC

OWC 512GB (4x128GB) DDR5 4800 CL40 4Rx4 288-pin 1.1V ECC Registered RDIMM memory upgrade

SKU CH-P94D-6PR0D

Adds 512 GB of DDR5 4800 ECC registered memory in four 128 GB modules for the Lenovo ThinkSystem SR950 V3 server

  • Capacity512GB (4 x 128GB)
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 4800 (PC5 38400)
  • CAS LatencyCL40
  • Voltage1.1V
  • ECCYes

Capacity 512GB (4 x 128GB)

  • 512 GB total capacity from four 128 GB modules for high-density server workloads
  • DDR5 4800 speed with CL40 latency delivers fast registered data transfer
  • ECC registered design detects and corrects errors to protect critical workloads
  • 1 V operation reduces power draw in dense ThinkSystem SR950 V3 configurations
  • JEDEC and RoHS compliant for warranty-safe upgrades in workstations and servers

Server memory kit

This OWC kit provides 512GB of DDR5 ECC registered memory in four 128GB modules built for the Lenovo ThinkSystem SR950 V3. It targets administrators who need maximum capacity in a validated server configuration. The modules are JEDEC-standard and RoHS compliant for warranty-safe deployment. They will not work in standard desktop computers or alongside unbuffered or load-reduced DIMMs.

Thermals and power

Each module operates at 1.1V without a heat spreader, relying on the server chassis airflow for cooling. Registered buffering and ECC circuitry add minimal overhead compared with unbuffered equivalents. Power draw scales with the 4800 MT/s data rate and quad-rank density under typical server workloads. Acoustic contribution is determined entirely by the host system fan curves.

Capacity and rank

The kit delivers 512GB total using a 4Rx4 organisation across four 288-pin RDIMMs. This rank structure and density define whether the memory controller can populate all slots at the rated speed. Buyers needing a different rank count or lower total capacity must select another kit.

Highlights

  • 512 GB total capacity from four 128 GB modules for high-density server workloads
  • DDR5 4800 speed with CL40 latency delivers fast registered data transfer
  • ECC registered design detects and corrects errors to protect critical workloads
  • 1 V operation reduces power draw in dense ThinkSystem SR950 V3 configurations
  • JEDEC and RoHS compliant for warranty-safe upgrades in workstations and servers

Specifications

BrandOWC
Part Number4R8D54R4512S
Capacity512GB (4 x 128GB)
Type288-Pin DDR5 ECC RDIMM
SpeedDDR5 4800 (PC5 38400)
CAS LatencyCL40
Voltage1.1V
ECCYes
Buffered/RegisteredRegistered
Rank4Rx4
Heat SpreaderNo
Compatible SystemLenovo ThinkSystem SR950 V3

Other versions of this model

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Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

How do I install the 4x128GB DDR5 4800 RDIMMs in the ThinkSystem SR950 V3 and what step is often missed?

Power down the server, open the chassis, and seat each 288-pin module firmly until the ejector tabs click; the step most often missed is populating all four modules in the exact slot order the SR950 V3 service guide specifies for 4Rx4 registered DIMMs.

What maintenance or replacement will this 512GB DDR5 4800 ECC registered kit need over time?

No routine maintenance is required; if a module fails, replace only the faulty 128GB stick — ECC corrects single-bit errors on the fly, but a hard fault means swapping that DIMM.

What limit appears first when the 4Rx4 DDR5 4800 CL40 1.1V kit runs sustained workloads on the SR950 V3?

The memory controller’s maximum supported bandwidth at DDR5 4800 is reached before thermal throttling, because the modules have no heat spreader and operate at standard 1.1V JEDEC voltage.

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