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Two green DDR5 ECC registered DIMMs with gold contacts

OWC

OWC 4R8D54R4256P 256GB (2x128GB) DDR5 4800 CL40 4Rx4 ECC RDIMM

SKU CH-GFQV-1FBE5

256 GB kit of two 128 GB DDR5 4800 CL40 ECC registered RDIMMs for Lenovo ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3 and SR665 V3 servers

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

Capacity 256GB (2 x 128GB)

  • ECC registered design protects data integrity in critical workloads
  • 256 GB total capacity across two 128 GB modules
  • DDR5 4800 speed with CL40 latency for responsive server performance
  • 1 V operation reduces power draw in dense configurations
  • Validated for Lenovo ThinkSystem SR635 V3 SR645 V3 SR650 V3 SR655 V3 SR665 V3

Server memory upgrade kit

This OWC kit supplies 256 GB of DDR5 ECC registered memory as two 128 GB modules. It is built for Lenovo ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3 and SR665 V3 servers. The modules will not work in standard desktop computers or in systems that require unbuffered or load-reduced DIMMs.

Registered ECC with 4Rx4 organisation

Each module runs at DDR5 4800 (PC5-38400) with CL40 latency at 1.1 V. The 288-pin RDIMM form factor and 4Rx4 rank structure are fixed by the server platform, so this kit only fits the listed ThinkSystem models. Mixing with unbuffered or LRDIMM memory is not supported.

JEDEC and RoHS compliant

Compliance means the modules meet the industry standard for DDR5 registered DIMMs and contain no restricted substances. This protects the server warranty and allows the memory to be installed as a direct replacement without additional qualification steps.

Highlights

  • ECC registered design protects data integrity in critical workloads
  • 256 GB total capacity across two 128 GB modules
  • DDR5 4800 speed with CL40 latency for responsive server performance
  • 1 V operation reduces power draw in dense configurations
  • Validated for Lenovo ThinkSystem SR635 V3 SR645 V3 SR650 V3 SR655 V3 SR665 V3

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
Heat SpreaderNo
Compatible SystemLenovo ThinkSystem SR635 V3
Lenovo ThinkSystem SR645 V3
Lenovo ThinkSystem SR650 V3
Lenovo ThinkSystem SR655 V3
Lenovo ThinkSystem SR665 V3

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Questions about this item

What does the 4800 MT/s speed deliver in a ThinkSystem SR655 V3?

The modules run at DDR5 4800 with CL40 latency, providing the rated data rate when installed in supported ThinkSystem servers.

How does the PC5-38400 designation relate to the installed modules?

PC5-38400 is the JEDEC standard name for DDR5 4800 memory; these 288-pin RDIMMs conform to that specification.

What physical slot and clearance do the 128 GB RDIMMs need?

Each module is a 288-pin DDR5 RDIMM without a heat spreader, designed for the standard DIMM slots in ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3 and SR665 V3 servers.

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