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Four green 288-pin DDR5 ECC RDIMM modules in anti-static tray

OWC

OWC 512GB (4×128GB) DDR5 4800 PC5-38400 CL40 4Rx4 288-pin 1.1V ECC RDIMM Kit

SKU CH-BNCQ-QTDS7

Adds 512 GB of DDR5 4800 ECC registered memory in four 128 GB modules for Lenovo ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3 and SR665 V3 servers

  • 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
  • DDR5 4800 speed with CL40 latency at 1.1 V
  • ECC registered 4Rx4 design for server data integrity
  • JEDEC and RoHS compliant for warranty-safe upgrades
  • Validated for ThinkSystem SR635 V3 SR645 V3 SR650 V3 SR655 V3 SR665 V3

OWC 512GB DDR5 ECC RDIMM Kit

This kit delivers 512GB of DDR5 4800 registered ECC memory across four 128GB modules. It targets administrators upgrading Lenovo ThinkSystem SR635 V3, SR645 V3, SR650 V3, SR655 V3 and SR665 V3 servers. The modules operate at 1.1V with CL40 latency and a 4Rx4 organisation. They are not compatible with standard desktop computers or unbuffered memory configurations.

Capacity and headroom for virtualisation

Four 128GB modules fill four slots to reach 512GB, supporting dense virtualisation, large databases and in-memory analytics. The registered design and ECC protect data integrity under sustained load. Systems requiring more than 512GB or a different rank configuration cannot use this kit. Mixing with load-reduced or unbuffered DIMMs is not supported.

JEDEC compliance and warranty-safe upgrade

The modules meet JEDEC PC5-38400 specifications and are ROHS compliant, ensuring a warranty-safe installation. OWC validates each module in-house and backs the kit with a limited lifetime warranty and an advanced replacement programme. No additional software or accessories are bundled; the value is in the validated compatibility and the replacement service.

Highlights

  • 512 GB total capacity from four 128 GB modules
  • DDR5 4800 speed with CL40 latency at 1.1 V
  • ECC registered 4Rx4 design for server data integrity
  • JEDEC and RoHS compliant for warranty-safe upgrades
  • Validated for ThinkSystem SR635 V3 SR645 V3 SR650 V3 SR655 V3 SR665 V3

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 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

Can I add this 512 GB DDR5 4800 CL40 4Rx4 ECC RDIMM kit to a ThinkSystem SR650 V3 that already has DDR5 4800 ECC RDIMMs installed?

Yes, the kit is validated for the SR650 V3 and runs at DDR5 4800 CL40; matching speed, voltage and registered ECC type lets the new 128 GB modules operate alongside existing DDR5 4800 RDIMMs in the same server.

How do I confirm the four 128 GB modules are running at DDR5 4800 CL40 with ECC active after installation?

Enter the system BIOS or UEFI and check the memory information screen — it should show 512 GB total, 4800 MT/s data rate, CL40 latency and ECC enabled for each of the four 288-pin RDIMM slots.

What exactly ships in the box and is anything else required to install the kit?

The box contains four 128 GB DDR5 4800 PC5-38400 CL40 4Rx4 288-pin 1.1 V ECC registered RDIMM modules; no cables, brackets or additional parts are included or needed for installation in a compatible ThinkSystem server.

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