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Eight green DDR5 RDIMM modules with gold contacts and black register chips

OWC

OWC 4R8D54R41TBK 1TB (8x128GB) DDR5 4800 CL40 ECC Registered RDIMM memory upgrade

SKU CH-Z1G6-0TC43

Eight 128 GB DDR5 4800 CL40 ECC registered RDIMMs totalling 1 TB for Lenovo ThinkSystem SR950 V3

  • Capacity1TB (8 x 128GB)
  • Type288-Pin DDR5 ECC RDIMM
  • SpeedDDR5 4800 (PC5 38400)
  • CAS LatencyCL40
  • Voltage1.1V
  • ECCYes

Capacity 1TB (8 x 128GB)

  • 1TB server capacity with eight 128GB modules
  • DDR5 4800 CL40 speed for data-intensive workloads
  • ECC registered design protects data integrity
  • 1V operation reduces power draw
  • Validated for Lenovo ThinkSystem SR950 V3

Server memory kit for Lenovo ThinkSystem SR950 V3

This OWC upgrade kit delivers 1TB of DDR5 memory across eight 128GB registered DIMMs. It is built for the ThinkSystem SR950 V3 server platform where ECC registered modules are required. The kit targets administrators expanding capacity in compatible workstations, NAS systems or network switches. It will not work in standard desktop computers or with unbuffered memory.

DDR5 4800 registered ECC constraints

The modules operate at DDR5 4800 (PC5-38400) with CL40 latency and 1.1V voltage. Registered ECC memory cannot be mixed with unbuffered or load-reduced DIMMs in the same system. The 288-pin form factor fits only slots wired for DDR5 registered ECC. Buyers who need unbuffered or consumer DDR5 must choose a different product.

4Rx4 128GB density per module

Each of the eight DIMMs uses a 4Rx4 organisation to reach 128GB density. This rank configuration determines whether the server memory controller can address the full 1TB kit. Systems limited to lower rank counts per channel will not recognise the full capacity.

Highlights

  • 1TB server capacity with eight 128GB modules
  • DDR5 4800 CL40 speed for data-intensive workloads
  • ECC registered design protects data integrity
  • 1V operation reduces power draw
  • Validated for Lenovo ThinkSystem SR950 V3

Specifications

BrandOWC
Part Number4R8D54R41TBK
Capacity1TB (8 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

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Questions about this item

Should I choose the 1TB kit with eight 128GB modules or a smaller capacity for my ThinkSystem SR950 V3?

The kit provides eight 128GB RDIMMs for a total of 1TB. Select this capacity if your workload needs the maximum supported memory per socket; otherwise a smaller kit leaves room for future expansion.

What does the DDR5 4800 CL40 rating deliver once installed in the SR950 V3?

The modules run at 4800 MT/s with a CAS latency of 40 cycles, giving the server JEDEC-standard bandwidth and error-corrected throughput for virtualization and database workloads.

How does the 288-pin registered ECC interface limit performance in practice?

The 288-pin RDIMM interface with registered buffering and ECC caps speed to the DDR5 4800 JEDEC standard while adding single-bit error correction and command-address parity for data integrity.

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